inspector: Remove flash timeout from widgets being unmapped
inspector: Remove flash timeout from widgets being unmapped

Otherwise the timeout can keep running, even if the widget is being
destroyed.

alexlarsson/gtk,Lyude/gtk-,jigpu/gtk,grubersjoe/adwaita,alexlarsson/gtk,alexlarsson/gtk,davidgumberg/gtk,ahodesuka/gtk,Adamovskiy/gtk,chergert/gtk,grubersjoe/adwaita,alexlarsson/gtk,grubersjoe/adwaita,chergert/gtk,Lyude/gtk-,jigpu/gtk,jigpu/gtk,Lyude/gtk-,jigpu/gtk,alexlarsson/gtk,Adamovskiy/gtk,Lyude/gtk-,ahodesuka/gtk,Lyude/gtk-,jadahl/gtk,jigpu/gtk,grubersjoe/adwaita,ahodesuka/gtk,chergert/gtk,jigpu/gtk,jigpu/gtk,ahodesuka/gtk,davidgumberg/gtk,davidgumberg/gtk,ahodesuka/gtk,chergert/gtk,alexlarsson/gtk,Lyude/gtk-,davidgumberg/gtk,davidgumberg/gtk,jadahl/gtk,grubersjoe/adwaita,chergert/gtk,Adamovskiy/gtk,jadahl/gtk,alexlarsson/gtk,Adamovskiy/gtk,ahodesuka/gtk,ahodesuka/gtk,grubersjoe/adwaita,ahodesuka/gtk,Adamovskiy/gtk,jadahl/gtk,jadahl/gtk,davidgumberg/gtk,davidgumberg/gtk,jigpu/gtk,chergert/gtk,Adamovskiy/gtk,jadahl/gtk,davidgumberg/gtk,jadahl/gtk,alexlarsson/gtk,chergert/gtk,jadahl/gtk,Adamovskiy/gtk,Adamovskiy/gtk,chergert/gtk,grubersjoe/adwaita,grubersjoe/adwaita,Lyude/gtk-,Lyude/gtk-