Add ability to use Container.Content "files"

Should be able to add "files" to the list also, unsure if it will work for all types, but works for videos in testing.

addon.xml

@@ -1,5 +1,5 @@
 <?xml version="1.1" encoding="UTF-8" standalone="yes"?>
-<addon id="plugin.program.shortlist" name="Shortlist" version="0.0.10" provider-name="kcook98765">
+<addon id="plugin.program.shortlist" name="Shortlist" version="0.0.11" provider-name="kcook98765">
   <requires>
     <import addon="xbmc.python" version="3.0.0"/>
   </requires>
@@ -28,7 +28,7 @@
       <menu id="kodi.core.main">
         <item library="capture.py">
             <label>30012</label>
-            <visible>[!String.IsEmpty(ListItem.DBID) + String.IsEqual(ListItem.DBType,movie)]</visible>
+            <visible>[!String.IsEmpty(ListItem.DBID) + String.IsEqual(ListItem.DBType,movie)] | String.IsEqual(Container.Content,files)</visible>
         </item>
       </menu>
     </extension>