Revert "privapp-permissions: Whitelist CHANGE_OVERLAY_PACKAGES permission"

Permission no longer required because Styles handling was
removed from LineageParts. ThemePicker is our best friend now.

This reverts commit a7b0cf7ec3.

Change-Id: I003cd2281de9f7edbd81a15e0c1b1258e537ccb3

config/permissions/privapp-permissions-lineage-system.xml

@@ -40,7 +40,6 @@
 
     <privapp-permissions package="org.lineageos.lineageparts">
         <permission name="android.permission.CHANGE_CONFIGURATION"/>
-        <permission name="android.permission.CHANGE_OVERLAY_PACKAGES"/>
         <permission name="android.permission.READ_SEARCH_INDEXABLES"/>
         <permission name="android.permission.WRITE_MEDIA_STORAGE"/>
         <permission name="android.permission.WRITE_SECURE_SETTINGS"/>