patch 8.2.4409: Vim9: some code not covered by tests

Problem:    Vim9: some code not covered by tests.
Solution:   Add a few more tests.  Fix reported line number.
diff --git a/src/version.c b/src/version.c
index edac690..89a9fbb 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4409,
+/**/
     4408,
 /**/
     4407,