Use flattenToShortString instead of toShortString on ComponentNames to

be sent in RecognizerIntent.EXTRA_CALLING_PACKAGE. This never should have
been using toShortString because that includes curly braces and is not
correctly parsed by ComponentName.unflattenFromString.

This was needed as part of http://b/2546173

Change-Id: If34a9273cbcae13a75347be0b6b7ef307134ed40