FvwmPager: geometry string with @monitor not taken into account

[ThomasAdam]

When FvwmPager is asked to start up in a position on a specific screen, such as:

DestroyModuleConfig FvwmPager:*
*FvwmPager: Geometry 100x90-0+0@MONITORNAME

FvwmPager gets confused, and doesn't place the window on the correct monitor, even though the overall XxY geometry is correct.