Check the tintable metadata before tinting tile icon.

When determining whether to tint the tile icon, first check whether the
tintable metadata set for the tile. If no metadata set, will then follow
the default logic that tint the tile icon if it is not coming from the
Settings package.

Change-Id: Idf0863e0c6ab063aeaa6d013fa620508ced31fdb
Fix: 62473193
Test: make RunSettingsRoboTests