This test kills the desktop shell process so it can set a different shell window.
Modern Windows will automatically restart the desktop shell when it dies, and if
that happens soon enough it will interfere with the remaining tests.

Disabling automatic restart requires admin rights.
Signed-off-by: Hans Leidekker <hans@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>