gdk: revert surface activation change

c926b28d ('gdk: do not deactivate surface on keyboard grabs') and
f23bfc6b ('gdk: activate surface on keyboard grabs') changed the
situation where surfaces are considered active by gdk. This however has
unwanted consequences in the behavior of gnome-shell which is not
properly transferring focus for Orca to get the proper active events,
see for instance GNOME/gnome-shell#452

We'd thus just better these changes for now, until such issues are
fixed.

See #85
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