Add missing colons to RTCPReceived and RTCPSent manager events.

(closes issue #13319)
Reported by: srt
Patches:
      13319_rtcp_manager_event_headers.diff uploaded by srt (license 378)


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@138476 65c4cc65-6c06-0410-ace0-fbb531ad65f3