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.

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3404,
 /**/
     3403,
 /**/