SystemUI: Add missing hdpi resources for left gravity recent panel

Change-Id: Ic2915cb7be01be9e66620e4d7edc530e0d75b404
Revert "FB: Slimrecents background color && transparency [2/2]"

This reverts commit b073d7b8bdfbb1c888fe6d875e6cbf6d727b862c.

Conflicts:
	core/java/android/provider/Settings.java

Change-Id: Ib15b1039fcb486ecdf3a60ee05df641905eade90

Conflicts:
	core/java/android/provider/Settings.java
FB: Slimrecents background color && transparency [2/2]

PS: now setting sticks through reboots and TRDS state
        changes. also, add reset to default color option.

PS: when resetting to default, use TRDS (png) resources
        instead of custom color

PS: remove LSN dependency

PS: make default background setting cognizant of
        recent panel gravity setting to display
        correct background resource

Conflicts:
	packages/SystemUI/src/com/android/systemui/slimrecent/RecentController.java

Change-Id: I5c81db94edb37ccdbd4943da11de9a277d6fe0fe

Conflicts:
	core/java/android/provider/Settings.java