patch 8.1.1920: cannot always close a popup when filter consumes all events

Problem:    Cannot close a popup by the X when a filter consumes all events.
Solution:   Check for a click on the close button before invoking filters.
            (closes #4858)

src/version.c

@@ -761,6 +761,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1920,
 /**/
     1919,
 /**/