Update builtin presets for Libadwaita 1.4 (#817)

## Description

#795 I've only done Adwaita and Adwaita Dark. I've no ideas how to do
Pretty Purple

## Type of change

<!-- What type of change does your pull request introduce? Put an `x` in
the appropriate box . -->
- [ ] Bugfix (Change which fixes an issue)
- [ ] New feature (Change which adds new functionality)
- [x] Enhancement (Change which slightly improves existing code)
- [ ] Breaking change (This change will introduce incompatibility with
existing functionality)

## Testing

- [x] I have tested my changes and verified that they work as expected
<!-- Make sure you did this step before marking your PR as ready for
merge. -->

data/presets/adwaita-dark.json

@@ -25,17 +25,27 @@
         "headerbar_border_color": "#ffffff",
         "headerbar_backdrop_color": "@window_bg_color",
         "headerbar_shade_color": "rgba(0, 0, 0, 0.36)",
+        "headerbar_darker_shade_color": "rgba(0, 0, 0, 0.9)",
         "card_bg_color": "rgba(255, 255, 255, 0.08)",
         "card_fg_color": "#ffffff",
         "card_shade_color": "rgba(0, 0, 0, 0.36)",
         "dialog_bg_color": "#383838",
         "dialog_fg_color": "#ffffff",
         "popover_bg_color": "#383838",
         "popover_fg_color": "#ffffff",
+        "popover_shade_color": "rgba(0, 0, 0, 0.36)",
         "shade_color": "rgba(0, 0, 0, 0.36)",
         "scrollbar_outline_color": "rgba(0, 0, 0, 0.5)",
         "thumbnail_bg_color": "#383838",
-        "thumbnail_fg_color": "#ffffff"
+        "thumbnail_fg_color": "#ffffff",
+        "sidebar_bg_color": "#303030",
+        "sidebar_fg_color": "#ffffff",
+        "sidebar_backdrop_color": "#2a2a2a",
+        "sidebar_shade_color": "rgba(0, 0, 0, 0.36)",
+        "secondary_sidebar_bg_color": "#2a2a2a",
+        "secondary_sidebar_fg_color": "#ffffff",
+        "secondary_sidebar_backdrop_color": "#272727",
+        "secondary_sidebar_shade_color": "rgba(0, 0, 0, 0.36)"
     },
     "palette": {
         "blue_": {

data/presets/adwaita.json

@@ -25,17 +25,27 @@
         "headerbar_border_color": "rgba(0, 0, 0, 0.8)",
         "headerbar_backdrop_color": "@window_bg_color",
         "headerbar_shade_color": "rgba(0, 0, 0, 0.07)",
+        "headerbar_darker_shade_color": "rgba(0, 0, 0, 0.12)",
         "card_bg_color": "#ffffff",
         "card_fg_color": "rgba(0, 0, 0, 0.8)",
         "card_shade_color": "rgba(0, 0, 0, 0.07)",
         "dialog_bg_color": "#fafafa",
         "dialog_fg_color": "rgba(0, 0, 0, 0.8)",
         "popover_bg_color": "#ffffff",
         "popover_fg_color": "rgba(0, 0, 0, 0.8)",
+        "popover_shade_color": "rgba(0, 0, 0, 0.07)",
         "shade_color": "rgba(0, 0, 0, 0.07)",
         "scrollbar_outline_color": "#ffffff",
         "thumbnail_bg_color": "#ffffff",
-        "thumbnail_fg_color": "rgba(0, 0, 0, 0.8)"
+        "thumbnail_fg_color": "rgba(0, 0, 0, 0.8)",
+        "sidebar_bg_color": "#ebebeb",
+        "sidebar_fg_color": "rgba(0, 0, 0, 0.8)",
+        "sidebar_backdrop_color": "#f2f2f2",
+        "sidebar_shade_color": "rgba(0, 0, 0, 0.07)",
+        "secondary_sidebar_bg_color": "#f3f3f3",
+        "secondary_sidebar_fg_color": "rgba(0, 0, 0, 0.8)",
+        "secondary_sidebar_backdrop_color": "#f6f6f6",
+        "secondary_sidebar_shade_color": "rgba(0, 0, 0, 0.07)"
     },
     "palette": {
         "blue_": {

data/presets/pretty-purple.json

@@ -25,17 +25,27 @@
         "headerbar_border_color": "#ffffff",
         "headerbar_backdrop_color": "@window_bg_color",
         "headerbar_shade_color": "rgba(0, 0, 0, 0.36)",
+        "headerbar_darker_shade_color": "rgba(0, 0, 0, 0.9)",
         "card_bg_color": "rgba(255, 255, 255, 0.08)",
         "card_fg_color": "#ffffff",
         "card_shade_color": "rgba(0, 0, 0, 0.36)",
         "dialog_bg_color": "#241f31",
         "dialog_fg_color": "#ffffff",
         "popover_bg_color": "#241f31",
         "popover_fg_color": "#ffffff",
+        "popover_shade_color": "rgba(0, 0, 0, 0.36)",
         "shade_color": "rgba(0, 0, 0, 0.36)",
         "scrollbar_outline_color": "rgba(0, 0, 0, 0.5)",
         "thumbnail_bg_color": "#241f31",
-        "thumbnail_fg_color": "#ffffff"
+        "thumbnail_fg_color": "#ffffff",
+        "sidebar_bg_color": "#39314e",
+        "sidebar_fg_color": "#ffffff",
+        "secondary_sidebar_bg_color": "#332b45",
+        "secondary_sidebar_fg_color": "#ffffff",
+        "sidebar_backdrop_color": "#332b45",
+        "secondary_sidebar_backdrop_color": "#2c253c",
+        "sidebar_shade_color": "rgba(0, 0, 0, 0.36)",
+        "secondary_sidebar_shade_color": "rgba(0, 0, 0, 0.36)"
     },
     "palette": {
         "blue_": {