Include the reason when firing the TitleMoveComplete hook

As with the ArticleDeletionComplete hook, include the reason for
moving the title (article) when firing the TitleMoveComplete hook.

See I98703f99a47d5786b7a567df954ba09f6d8862ff for a supporting use
case.

Change-Id: I875446dddacff7e5a52a0b6e577e6a46a9ae2e6f
Merge "Include the reason when firing the TitleMoveComplete hook"