remove AppImage hack for broken Wayland in Qt5

Author: notimaginative

qtfred/cmake/AppRun.in

@@ -2,11 +2,4 @@
 HERE=$(dirname $(readlink -f "${0}"))
 export LD_LIBRARY_PATH=${HERE}/lib:$LD_LIBRARY_PATH
 
-# Qt5 doesn't work so well with Wayland for us so prefer the use of X11 unless
-# another backend is already specified
-# (NOTE: the -platform option will override this so we don't need to test for it)
-if [ -z "$QT_QPA_PLATFORM" ]; then
-	export QT_QPA_PLATFORM="xcb;wayland"
-fi
-
 exec "${HERE}/bin/$<TARGET_FILE_NAME:qtfred>" "$@"