manager: Return ActionID on nominal responses to PresenceState action

When the PresenceState action is executed, the nominal path fails to include
the ActionID in the successful response. This patch adds a call to
astman_start_ack, which guarantees that an ActionID (if provided) will be
sent back to the AMI client.

Review: https://reviewboard.asterisk.org/r/3776/

ASTERISK-23985 #close


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@418713 65c4cc65-6c06-0410-ace0-fbb531ad65f3