Sets the correct musicclass after an announcement

(closes issue #15279)
Reported by: mbeckwell
Patches:
      patch.txt uploaded by mnick (license )
Tested by: mnick

(closes issue #15832)
Reported by: mbeckwell
Patches:
      patch.txt uploaded by mnick (license 874)
Tested by: mnick




git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@217730 65c4cc65-6c06-0410-ace0-fbb531ad65f3