core: Fix too long ON/OFF strings

Use Unicode chars '❙' for ON and '〇' for OFF

Change-Id: I563f1ea331a07dcaeedce28688c2121de0716185
A background started service is removed from mStartingBackground when timeout.
Fix is to make sure mStartingBackground is updated to remove one.

Change-Id: I0e42beb550d33e6e400349b85bbb89848e18d520