patch 8.2.2729: Vim9: wrong error message for referring to legacy script var

Problem:    Vim9: wrong error message for referring to legacy script variable.
Solution:   Do allow referring to a variable in legacy script without "s:" if
            it exists at compile time. (closes #8076)
diff --git a/src/version.c b/src/version.c
index f041987..8d44824 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2729,
+/**/
     2728,
 /**/
     2727,