Fix fullscreen size specification and add fallback on fail
Fix fullscreen size specification and add fallback on fail

ppy/osu-framework,ZLima12/osu-framework,ZLima12/osu-framework,peppy/osu-framework,peppy/osu-framework,peppy/osu-framework,ppy/osu-framework,ppy/osu-framework,smoogipooo/osu-framework,smoogipooo/osu-framework