patch 8.2.3191: Vim9: not enough code is tested

Problem:    Vim9: not enough code is tested.
Solution:   Use CheckLegacyAndVim9Success() in more places.  Fix uncovered
            problems.

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3191,
 /**/
     3190,
 /**/