patch 8.2.1065: Vim9: no line break allowed inside a list

Problem:    Vim9: no line break allowed inside a list.
Solution:   Handle line break inside a list in Vim9 script.
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 054eaa6..f133a94 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -2989,7 +2989,7 @@
     {
 
 	// Can be "[1, 2, 3]->Func()".
-	if (get_list_tv(&p, &rettv, 0, FALSE) == FAIL)
+	if (get_list_tv(&p, &rettv, NULL, FALSE) == FAIL)
 	    p = arg;
     }
     else if (p == arg && *arg == '#' && arg[1] == '{')