patch 7.4.1817

Problem:    The screen is not updated if a callback is invoked when closing a
            channel.
Solution:   Invoke redraw_after_callback().

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1817,
 /**/
     1816,
 /**/