Update error message in test for file reload

Author: ashm-dev

Lib/idlelib/idle_test/test_iomenu.py

@@ -79,7 +79,7 @@ def mock_showinfo(*args, **kwargs):
             result = io.reload(None)
             self.assertEqual(result, "break")
             self.assertEqual(len(showinfo_called), 1)
-            self.assertIn("No File", showinfo_called[0][0])
+            self.assertIn("File Not Found", showinfo_called[0][0])
         finally:
             iomenu.messagebox.showinfo = orig_showinfo