Fix for bug 91904, submitted by neil@parkwaycc.co.uk; add call to FlashWindow( .., FALSE )

when turning flashing off; r=law, sr=blake

widget/src/windows/nsWindow.cpp

@@ -5629,6 +5629,7 @@ static VOID CALLBACK nsGetAttentionTimerFunc( HWND hwnd, UINT uMsg, UINT idEvent
         // We're not in the foreground yet.
         FlashWindow( hwnd, TRUE );
     } else {
+        FlashWindow( hwnd, FALSE );
         KillTimer( hwnd, idEvent );
     }
 }