drm/qxl: only report first monitor as connected if we have no state

[ Upstream commit 69e5d3f893e19613486f300fd6e631810338aa4b ]

If the server isn't new enough to give us state, report the first
monitor as always connected, otherwise believe the server side.

Cc: stable@vger.kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>