Use QEMU_VIDEO_DEVICE instead of QEMUVGA
Fixes deprecation warning from isotovideo:
[pid:28] !!! backend::qemu::_set_graphics_backend: QEMUVGA is deprecated, please set QEMU_VIDEO_DEVICE
Fixes deprecation warning from isotovideo:
[pid:28] !!! backend::qemu::_set_graphics_backend: QEMUVGA is deprecated, please set QEMU_VIDEO_DEVICE