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.
diff --git a/src/version.c b/src/version.c
index 6802e0b..e6f81ca 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3191,
+/**/
     3190,
 /**/
     3189,