Fix xdg-settings support for default-web-browser for Plasma 5.19+
Double save the old way of setting the browser and the specification one for maximum compatibly and reads x-scheme-handler/http as the priority setting same as KDE 5.19+.
Double save the old way of setting the browser and the specification one for maximum compatibly and reads x-scheme-handler/http as the priority setting same as KDE 5.19+.