Update wallpaper packageMonitor & tryToRebind for LWP

Without this, a wallpaper crash on lock screen will lead to a black lock
screen, instead of a revert to the default wallpaper.

Flag: lockscreen lwp
Bug: 298366419
Test: atest WallpaperManagerTest
Test: manual: put two different wallpapers on home & lock and run adb
shell am force-stop <name of the lock screen wallpaper process>

Change-Id: I466acd7e80dd876f29a4baa650c68e4546b312f4