Ringtone picker to handle RESULT_CANCELED from Add ringtone

When a user backs out of the "Add ringtone" menu no ringtone is
shown as selected.
   This change fixes this issue by handling RESULT_CANCELED code
from the activity for "+ Add ringtone" to show the list properly.

Bug: 176465037
Change-Id: I4cc4b4c01477e173c766b67167c0e249a6d55bbf
1 file changed