Fix leftAffordanceView visibility bug

When you disable the left bottom lockscreen target, is suppose to be completely disabled like the right target.
While the icon itself disappears, the preview and hint are still present. This fixes that :-)

See images to see bug:
http://i.imgur.com/WhBvZkc.jpg & http://i.imgur.com/otyOn6m.png

Change-Id: If5b30f03649d5081409a98dbd36c49b99a5095d7