We've got to set the gui_fullscreen variable before creating the
SDL2 window, otherwise the initial window will not be created in
fullscreen mode.

Buglink: https://bugs.launchpad.net/bugs/1780812


Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-id: 1531161850-6860-1-git-send-email-thuth@redhat.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>