CM11 Themes: remove handleThemeConfigChanges

This was used by the T-Mobile theme chooser and is no longer
needed with the new chooser.

Change-Id: I035606ffe6cb3efc82a3a0ce79215509d8289503
Merge "CM11 Themes: remove handleThemeConfigChanges" into cm-11.0
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0-sgt7