patch 8.1.1107: no test for 'visualbell'

Problem:    No test for 'visualbell'.
Solution:   Add a test.

src/testdir/test_options.vim

@@ -536,5 +536,10 @@ func Test_writedelay()
   call assert_inrange(30 * 0.01, 999.0, elapsed)
 
   bwipe!
-  delfunc ChangeText
+endfunc
+
+func Test_visualbell()
+  set visualbell
+  call assert_beeps('normal 0h')
+  set novisualbell
 endfunc

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1107,
 /**/
     1106,
 /**/