Screen.c: fix handling of AllScreens without a running window manager

When used with the old nomachine nxclient (nxclient-3.5.0-9.exe) on
Windows for running a desktop session the screen size was wrong (set
to 3/4 of the requested size while also activating fullscreen because
in that case nomachine's nxwin does not offer a window manager).

Fix this by always setting AllScreens to true when there's no window
manager, just as it was already done with the FullScreen variable.

Fixes: ArcticaProject/nx-libs#1030

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