patch 8.2.2405: Vim9: no need to allow white space before "(" for :def

Problem:    Vim9: no need to allow white space before "(" for :def.
Solution:   Give an error for stray white space. (issue #7734)
diff --git a/src/version.c b/src/version.c
index 43ad049..136448a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2405,
+/**/
     2404,
 /**/
     2403,