privacy guard: allow as well image resources for light background

allow to fetch icons which fit on light background if needed. (Settings eg and
later other security features)

Change-Id: I6445bf0fc1a05718af01d83e29fc6d01b8f11c6c
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>

Conflicts:
	core/res/res/values/slim_symbols.xml