patch 8.2.2115: Vim9: some errors not tested for; dead code

Problem:    Vim9: some errors not tested for; dead code.
Solution:   Add a test.  Remove dead code.
diff --git a/src/version.c b/src/version.c
index b352082..3d48637 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2115,
+/**/
     2114,
 /**/
     2113,