widget-factory: Stop using the deprecated GtkAlignment::left-padding
widget-factory: Stop using the deprecated GtkAlignment::left-padding

These alignments can just be dropped without loss.

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