Added debugging output to check window class of active window

when leaving screen.  This may help determine how to avoid
DOS command prompt windows being in the foreground when leaving
the screen since they suppress handling of the shift key.

lib/platform/CMSWindowsDesks.cpp

@@ -623,6 +623,7 @@ CMSWindowsDesks::deskLeave(CDesk* desk, HKL keyLayout)
 					EnableWindow(desk->m_window, TRUE);
 					SetActiveWindow(desk->m_window);
 				}
+				LOG((CLOG_DEBUG1 "active window class: %s", className));
 			}
 		}