FreeSWITCH-FS-6836

Merge pull request #993 in FS/freeswitch from ~DRAGOS_OANCEA/freeswitch-dragos:fix_amr_mode-set_fmtp to master

* commit 'bc8518858e38488d3e6a08aeb8b01f0f223033a8':
  FS-9613: mod_amr: fix AMR mode bitmap ("mode-set" param in remote fmtp)