Attach work badge to Weather and Battery widgets

Moving the part where widget icon is generated from WidgetsListHeader (UI thread) to IconCache (backend)

Test: Open widget picker -> switch to work widget picker -> verify that Battery and Weather are badged
Fix: 226132413, 209995894
Change-Id: I3d649f2b26d7d8e7b756129b5bae4433ea344d43
3 files changed