patch 8.2.2628: Vim9: #{ can still be used at the script level

Problem:    Vim9: #{ can still be used at the script level.
Solution:   Give an error for #{ like in a :def function.
diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 477d140..67bcc73 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -5234,7 +5234,8 @@
 	return TRUE;
 #ifdef FEAT_EVAL
     if (in_vim9script())
-	return c == '#' && (cmd == cmd_start || VIM_ISWHITE(cmd[-1]));
+	return c == '#' && cmd[1] != '{'
+				 && (cmd == cmd_start || VIM_ISWHITE(cmd[-1]));
 #endif
     return c == '"';
 }