usb-tablet: fix serial compat property

usb-tablet: fix serial compat property

s/kbd/tablet/, fixes cut+paste bug.

Cc: qemu-stable@nongnu.org
Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-id: 20190520081805.15019-1-kraxel@redhat.com
(cherry picked from commit 442bac16a6cd708a9f87adb0a263f9d833f03ed5)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>