fix window gravity regression

[chkno]

The update at http://www.winehq.org/hypermail/wine-cvs/2005/02/0100.html
caused a regression in the case where x11drv's Desktop is set and the
application tries to change the resolution to something else.

The attached patch backs out a portion of that update.

Screenshots of the problem at http://bugs.winehq.org/show_bug.cgi?id=3018
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