Delay showing the task toolbar after VisualEditor edit

Now that the VisualEditor includes whether or not the user edited the
page in the ve.deactivationComplete[0], it's trival to delay showing
the task toolbar until the postEdit.aferRemoval event has fired.

[0] I0f5067550921008f74221d6c92882adfe404b3a5

Bug: 52955
Change-Id: Ibc1fb1c9ba73ec593c704f79124698bbb8bbee1a
Merge "Delay showing the task toolbar after VisualEditor edit"