patch 8.2.4946: Vim9: some code not covered by tests

Problem:    Vim9: some code not covered by tests.
Solution:   Add a few more test cases.  Remove dead code.
diff --git a/src/version.c b/src/version.c
index 45f0f28..e63e6b1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4946,
+/**/
     4945,
 /**/
     4944,