Finish test for axes labels

We had left one check commented out that was to be made into meaningful
code. As the test was passing (aside from the flakiness mentioned in
issue #297), this extra check was perhaps not really necessary, and were
not sure if it might help with the mentioned flakiness either.

Closes #306

tests/views/test_response_correlation.py

@@ -98,8 +98,7 @@ def test_axes_labels(mock_data, dash_duo):
         )
         selected_response_closer.click()
 
-    # wait for deselected option to reappear among available options
-    # response_selector_id = plugin.uuid("parameter-selector-multi-resp")
-    # dash_duo.wait_for_element(f"#{response_selector_id}
+        # wait for deselected option to reappear among available options
+        dash_duo.wait_for_contains_text(f"#{response_selector_id}", wanted_response)
 
     # assert dash_duo.get_logs() == [], "browser console should contain no error"