FvwmPager: CalcGeom: initial rectangle off screen

If CalcGeom isn't sent a valid monitor or is sent a monitor
different than the one being tracked, the default rectangle
is returned. Place this default rectangle off the screen like
is done with other windows.

modules/FvwmPager/x_pager.c

@@ -304,7 +304,8 @@ static struct fpmonitor *fpmonitor_from_xy(int x, int y, bool allow_null)
 
 static rectangle CalcGeom(PagerWindow *t, bool is_icon)
 {
-	rectangle rec = {0, 0, 0, 0};
+	/* Place initial rectangle off screen. */
+	rectangle rec = {-32768, -32768, 0, 0};
 	struct fpmonitor *fp = fpmonitor_this(NULL);
 
 	/* If the monitor we expect to find is disabled, then