patch 8.2.4016: Vim9: incorrect error for argument that is shadowing var

Problem:    Vim9: incorrect error for argument that is shadowing var.
Solution:   Ignore variable that is not in block where the function was
            defined.
diff --git a/src/version.c b/src/version.c
index d331c87..dafef8e 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4016,
+/**/
     4015,
 /**/
     4014,