patch 8.1.1328: no test for listener with undo operation

Problem:    No test for listener with undo operation.
Solution:   Add a test.
diff --git a/src/version.c b/src/version.c
index d45484f..74dba7c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1328,
+/**/
     1327,
 /**/
     1326,