patch 8.2.2015: Vim9: literal dict #{} is not like any other language

Problem:    Vim9: literal dict #{} is not like any other language.
Solution:   Support the JavaScript syntax.
diff --git a/src/testdir/test_vim9_builtin.vim b/src/testdir/test_vim9_builtin.vim
index cf12267..3129734 100644
--- a/src/testdir/test_vim9_builtin.vim
+++ b/src/testdir/test_vim9_builtin.vim
@@ -226,7 +226,7 @@
 
 
 def Wrong_dict_key_type(items: list<number>): list<number>
-  return filter(items, {_, val -> get({val: 1}, 'x')})
+  return filter(items, {_, val -> get({[val]: 1}, 'x')})
 enddef
 
 def Test_filter_wrong_dict_key_type()