Update AgentTicketZoom.tt

ArticleDynamicField documentation adjustment
Update AgentTicketZoom.tt

Missed one... again.
Also remove valid_id from initial inserts to ticket and ticket_history tables.
Improved performance of YAML decoding.
Merge branch 'patch-4' of github.com:crythias/otrs
Merge remote-tracking branch 'upstream/master' into otrs-master