LockscreenTargets : Dismiss on target select

Only dismiss prior to activity launch for lockscreen shortcuts,
camera and appwidget picker remain untouched.

Change-Id: I2770c628ce0708570aa6ea0eac9e3cd1d82287fb
Merge "LockscreenTargets : Dismiss on target select" into jb4.2
Merge remote-tracking branch 'slim/jb4.2' into mirage