patch 8.2.3854: Vim9: inconsistent arguments for test functions

Problem:    Vim9: inconsistent arguments for test functions.
Solution:   When :def function and script have different arguments use a list
            with two items instead of a separate function.

src/version.c

@@ -749,6 +749,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3854,
 /**/
     3853,
 /**/