Fixing color hints adjustment on live wallpapers and lock screen when

wallpaper is dimmed

When dimming is applied on live wallpapers, remove
HINT_SUPPORTS_DARK_TEXT/_THEME hints from the color hints to disable
dark text by default.

Test: manual, atest WallpaperManagerServiceTest
Bug: 217367978
Change-Id: Ia614c0b36f84c707a7eb3dabdc7a1eb90992bf3c