Use less brittle mixin type for map-options tooltip injection

src/main/java/uk/protonull/civvoxelmap/mixins/settings/GuiMinimapOptionsMixin.java

@@ -1,37 +1,30 @@
 package uk.protonull.civvoxelmap.mixins.settings;
 
-import com.llamalad7.mixinextras.sugar.Local;
 import com.mamiyaotaru.voxelmap.gui.GuiMinimapOptions;
 import com.mamiyaotaru.voxelmap.gui.overridden.GuiOptionButtonMinimap;
 import net.minecraft.client.gui.components.Tooltip;
 import net.minecraft.network.chat.Component;
 import org.jetbrains.annotations.NotNull;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
-import org.spongepowered.asm.mixin.injection.Inject;
-import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+import org.spongepowered.asm.mixin.injection.ModifyVariable;
 
 @Mixin(GuiMinimapOptions.class)
 public abstract class GuiMinimapOptionsMixin {
     // ============================================================
     // Warnings
     // ============================================================
 
-    @Inject(
+    @ModifyVariable(
         method = "init",
-        at = @At(
-            value = "INVOKE",
-            target = "Lcom/mamiyaotaru/voxelmap/gui/GuiMinimapOptions;addRenderableWidget(Lnet/minecraft/client/gui/components/events/GuiEventListener;)Lnet/minecraft/client/gui/components/events/GuiEventListener;",
-            ordinal = 0,
-            shift = At.Shift.BEFORE
-        )
+        at = @At("STORE")
     )
-    private void cvm$init$addTooltipWarnings(
-        final @NotNull CallbackInfo ci,
-        final @NotNull @Local GuiOptionButtonMinimap button
+    protected @NotNull GuiOptionButtonMinimap civvoxelmap$addTooltipWarnings(
+        final @NotNull GuiOptionButtonMinimap button
     ) {
         switch (button.returnEnumOptions()) {
             case CAVEMODE -> button.setTooltip(Tooltip.create(Component.translatable("civvoxelmap.feature.illegal.tooltip.off")));
         }
+        return button;
     }
 }