Revert "window-x11: Fix the coordinates we use in the synthetic ConfigureNotify"

The coordinates in ConfigureNotify *should* be the coordinates of the
client window; using the coordinates of the frame window compensated for
a problem with the interpretation of StaticGravity for some clients but
broke other clients.

This reverts commit f4f70afe313cbae2414296028f24647dbcd65dfd.

https://bugzilla.gnome.org/show_bug.cgi?id=736719
Fix computation of window positions for StaticGravity

When adjust_for_gravity() was simplified (01b6445708), the correct
handling of StaticGravity dropped out - fix adjust_for_gravity() to do
nothing in that case.

https://bugzilla.gnome.org/show_bug.cgi?id=736719