Settings: fix some icons (2/3)

Conflicts:
	res/drawable-hdpi/ic_settings_privacy_guard.png
	res/drawable-mdpi/ic_settings_privacy_guard.png
	res/drawable-xhdpi/ic_settings_privacy_guard.png
	res/drawable-xxhdpi/ic_settings_privacy_guard.png

Change-Id: I923c28b01a819c79bd4965b61337fdc99cb53c0b