Fix themed settings icons.

- Added android prefix for homeAsUpIndicator attribute
- Override ic_arrow_down_24dp from androidx
- Remove ic_lock drawable overlay
- Update date and time icon
- Dedupe ic_menu_add and ic_add_24dp

Bug: 131346125
Test: mp settings;
Change-Id: I7223249f2adccc5569a37e8b68cae5499e7c7620

src/com/android/settings/applications/defaultapps/DefaultAutofillPicker.java

@@ -178,7 +178,7 @@ public class DefaultAutofillPicker extends DefaultAppPickerFragment {
                     return true;
                 });
         preference.setTitle(R.string.print_menu_item_add_service);
-        preference.setIcon(R.drawable.ic_menu_add);
+        preference.setIcon(R.drawable.ic_add_24dp);
         preference.setOrder(Integer.MAX_VALUE -1);
         preference.setPersistent(false);
         return preference;