patch 8.1.1107: no test for 'visualbell'

Problem:    No test for 'visualbell'.
Solution:   Add a test.
diff --git a/src/version.c b/src/version.c
index 9fd355a..e1809c6 100644
--- a/src/version.c
+++ b/src/version.c
@@ -772,6 +772,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1107,
+/**/
     1106,
 /**/
     1105,