If the attended transfer destination answers (picks call up or goes to
voicemail) and then hangs up on the transferer then transferer hears the
fail sound.

This patch makes it so the fail sound is not played when the transfer
destination/target hangs up after answering.

ASTERISK-25697 #close

Change-Id: I97f142fe4fc2805d1a24b7c16143069dc03d9ded