[Bug 755249] gtkglsink: Hide and cleaned the GtkWindow we might create

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755249

--- Comment #8 from Thibault Saunier <tsaunier at gnome.org> ---
Created attachment 311734
  --> https://bugzilla.gnome.org/attachment.cgi?id=311734&action=edit
gtksink: Do not re destroy the GtkWindow if destroyed by the user

Otherwise we will get an ASSERT.

Fixes

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