Themes: Only kill launchers if overlays or icons changed

There is no need to kill the launcher for every coponent changed.
The only ones that really concern us in regards to killing launchers
are MODIFIES_OVERLAYS and MODIFIES_ICONS

Change-Id: I840b8e2ecd4b52a33f352809c5d3d2c7e92ce85e
Merge "Themes: Only kill launchers if overlays or icons changed" into kitkat