Refactor click since it was resulting in timeout errors; use correct id for one…

Refactor click since it was resulting in timeout errors; use correct id for one of the LTI stub's buttons.

common/djangoapps/terrain/stubs/lti.py

@@ -194,7 +194,7 @@ class StubLtiHandler(StubHttpRequestHandler):
                     <input type="submit" name="submit-button" value="Submit" id="submit-button">
                 </form>
                 <form action="{submit_url}/lti2_outcome" method="post">
-                    <input type="submit" name="submit-lti2-button" value="Submit" id="submit-lti-button">
+                    <input type="submit" name="submit-lti2-button" value="Submit" id="submit-lti2-button">
                 </form>
                 <form action="{submit_url}/lti2_delete" method="post">
                     <input type="submit" name="submit-lti2-delete-button" value="Submit" id="submit-lti-delete-button">

lms/djangoapps/courseware/features/lti.py

@@ -359,8 +359,9 @@ def click_grade(_step, version):
     location = world.scenario_dict['LTI'].location.html_id()
     iframe_name = 'ltiFrame-' + location
     with world.browser.get_iframe(iframe_name) as iframe:
-        world.wait_for_visible('#' + version_map[version]['selector'])
-        iframe.find_by_name(version_map[version]['selector']).first.click()
+        css_loc = '#' + version_map[version]['selector']
+        world.wait_for_visible(css_loc)
+        world.css_click(css_loc)
         assert iframe.is_text_present(version_map[version]['expected_text'])