Removed periodic call to XForceScreenSaver() to prevent the built-in

screen saver from activating.  It was unnecessary since the built-in
screen saver is disabled as appropriate;  this call was just to
ensure that the screen saver wouldn't start if an external program
reactivated the screen saver after synergy disabled it.

It's possible that this was causing screen flicker under gnome, though
i don't know why.  It's also possible that periodically sending events
to xscreensaver is causing the flicker but removing that code is more
difficult because xscreensaver can't be disabled, only deactivated or
killed.

lib/platform/CXWindowsScreenSaver.cpp

@@ -479,7 +479,4 @@ CXWindowsScreenSaver::disableCallback(void*)
 		CXWindowsUtil::CErrorLock lock(m_display);
 		XSendEvent(m_display, m_xscreensaver, False, 0, &event);
 	}
-
-	// force screen saver off and reset the timer
-	XForceScreenSaver(m_display, ScreenSaverReset);
 }