patch 8.1.0233: "safe" argument of call_vim_function() is always FALSE

Problem:    "safe" argument of call_vim_function() is always FALSE.
Solution:   Remove the argument.
diff --git a/src/ex_getln.c b/src/ex_getln.c
index e659c1a..54b3796 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -5279,7 +5279,7 @@
  */
     static void *
 call_user_expand_func(
-    void	*(*user_expand_func)(char_u *, int, typval_T *, int),
+    void	*(*user_expand_func)(char_u *, int, typval_T *),
     expand_T	*xp,
     int		*num_file,
     char_u	***file)
@@ -5318,7 +5318,7 @@
     ccline.cmdprompt = NULL;
     current_SID = xp->xp_scriptID;
 
-    ret = user_expand_func(xp->xp_arg, 3, args, FALSE);
+    ret = user_expand_func(xp->xp_arg, 3, args);
 
     ccline = save_ccline;
     current_SID = save_current_SID;