QuickSettings: Don't show the Camera tile if the device has no cameras

just realized it's somehow missing in cm-10.2

Change-Id: I1ab38766e762d2a55a24e9ae4e4549de81a545e7
QuickSettingsUtil: Remove unnecessary check

Change-Id: I6946da7310aa177ea29d41f52197945d435c086a
Fix broken target icon.

Steps to reproduce:
- Assign an icon from file
- Save
- Reopen lockscreen targets
- Assign a resource icon
- Save

Result: You'll get the application icon, because the icon file reference
is still present, but the file is no longer there.

Change-Id: I8851f5fbdebfeeef9459c5b44c599e489b2dda3a