Fix crash in Bluetooth when sharing MMS video.

Some content providers, such as MMS, don't support the DISPLAY_NAME
or SIZE columns for content URIs. Fall back to using the last segment
of the URI as the filename for Bluetooth file transfers if the query
for DISPLAY_NAME fails.

Bug: 7343310
Change-Id: Ie048c5eea3ba9994259c9e07beabd72622d6b669