GtkEntry: Make has-frame use style classes
GtkEntry: Make has-frame use style classes

Instead of code that internally does weird things, use the FLAT style
class if has-frame is FALSE and remove it otherwise.
Based on a patch by Benjamin Otte.
https://bugzilla.gnome.org/show_bug.cgi?id=732256

fixup entry

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