Fix a couple issues with events when submitting an inlineEditor.

When submitting an inlineEditor that has not changed, the caller is left
with either no idea that the editor was ever closed, or with misleading
data, which can mess with things like edit counts.

There are two cases where this occurs.

The first case is the standard case where nothing is changed and the
field is submitted. There's no callback that occurs letting the caller
know that anything happened. We now reuse the cancel callback for this.

The second case is when notifyUnchangedCompletion is true. The caller
will get notified of the "completion" callback, and is passed the new
value and the initial value. These will be the same when nothing has
changed. However, even if something has changed, the initial value is still
pointing to the new value, due to pulling from a bad variable when
triggering this event.

Both cases have been fixed.

Tested with some changes I'm putting together in Review Board. The bug actually
manifests in released versions. If you open and close the draft banner's description
editor a couple times, the edit counts will be wrong.