patch 8.2.2167: Vim9: assign test fails

Problem:    Vim9: assign test fails. (Elimar Riesebieter)
Solution:   Adjust the test for dict assignment.
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index c9872d4..4a6f1a7 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -561,10 +561,24 @@
   assert_equal(dict3, {key: 'yet another'})
 
   var lines =<< trim END
+    vim9script
+    var dd = {}
+    dd.two = 2
+    assert_equal({two: 2}, dd)
+  END
+  CheckScriptSuccess(lines)
+
+  lines =<< trim END
     var dd = {one: 1}
     dd.one) = 2
   END
-  CheckDefFailure(lines, 'E15:', 2)
+  CheckDefFailure(lines, 'E488:', 2)
+
+  lines =<< trim END
+    var dd = {one: 1}
+    var dd.one = 2
+  END
+  CheckDefAndScriptFailure(lines, 'E1017:', 2)
 
   # empty key can be used
   var dd = {}