IllegalStateException fixed in print service settings

Settings crashed due to IllegalStateException
as OnQueryTextListener refers to an already
detached view. The listener is set to null
on press of home key (onPause).

Change-Id: If9c76fe3ff040c295f0af9c092e8824b9a1371d7
Merge "IllegalStateException fixed in print service settings" into lp5.0-caf