patch 8.2.3404: Vim9: no error for white space before "("

Problem:    Vim9: no error for white space before "(".
Solution:   Give an error, like in a compiled function.
diff --git a/src/version.c b/src/version.c
index 97467aa..cfddf6b 100644
--- a/src/version.c
+++ b/src/version.c
@@ -756,6 +756,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3404,
+/**/
     3403,
 /**/
     3402,