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

Change-Id: I159a757cc8bf39692dd3ff43f5e2e5ea41de4b55