patch 8.1.1167: no test for closing tab by click in tabline

Problem:    No test for closing tab by click in tabline.
Solution:   Add a test.  Also fix that dragging window separator could fail in
            a large terminal. (Dominique Pelle, closes #4253)

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1167,
 /**/
     1166,
 /**/