Themes: Fix native crash in libandroidfw

If a missing attribute needs to be added in somewhere in the middle
of the bag, a segfault would occur because we change curEntry to a
value that is beyond the set's allocated space.  This patch stores
curEntry in prevEntry before changing it's value and memmove uses
prevEntry to index the set.

Change-Id: Ie70f2ad465097c3acf76caa729999c424fb01ee2
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: I3b32a20431f242f58c1708f72418322f0a5db44e

Conflicts:
	services/java/com/android/server/ThemeService.java