[AD] [WIN] Minor fix related to save_window_pos()

["Eric Botcazou" <ebotcazou@xxxxxxxxxx>]

save_window_pos() was inconditionally called by the *_exit() function of
the three window drivers, without taking into account whether the driver
had been successfully set up. Therefore, if it had not been the case,
save_window_pos() ended up saving the position of the hidden window, that
is (-100, -100). Obviously not very nice.

The attached patch has already been applied.

--
Eric Botcazou
ebotcazou@xxxxxxxxxx

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