Add screen resource for Colors setting.

- each preference fragment should have its own preference screen layout
in order to show the title correctly. Adding the missing data for
ColorModePreferenceFragment.

Change-Id: I172429dc957f94351456d4bc829897a578d7dbf9
Fixes: 68763217
Test: make RunSettingsRoboTests

src/com/android/settings/widget/RadioButtonPickerFragment.java

@@ -82,6 +82,9 @@ public abstract class RadioButtonPickerFragment extends InstrumentedPreferenceFr
         return view;
     }
 
+    @Override
+    protected abstract int getPreferenceScreenResId();
+
     @Override
     public void onRadioButtonClicked(RadioButtonPreference selected) {
         final String selectedKey = selected.getKey();