[ATL] Fix window position to fit in screen area (#4512)

[ATL] Fix window position to fit in screen area (#4512)

Clicking "Edit compatibility modes" button in the "Compatibility" tab
opens a window centered on the parent window. If we move the parent
window to one of the screen edges and then click this button again,
the new window will appear off screen.

Adjust position of created window, so now it would be completely visible.

CORE-17089

Reviewed-by: Mark Jansen <mark.jansen@reactos.org>
Reviewed-by: Hermès Bélusca-Maïto <hermes.belusca-maito@reactos.org>