Include edit status in the ve.deactivationComplete event

Rather than setting the wgPostEdit configuration variable when the
user uses VisualEditor, i.e. communicating via mutable global
state, include whether or not the user edited the page in the
ve.deactivationComplete event.

Bug: 52955
Change-Id: I0f5067550921008f74221d6c92882adfe404b3a5
Merge "Include edit status in the ve.deactivationComplete event"