Fixed most of the lms tests to work on firefox

lms/djangoapps/courseware/features/high-level-tabs.py

@@ -8,4 +8,5 @@ def i_click_on_the_tab_and_check(step):
         tab_text = tab_title['TabName']
         title = tab_title['PageTitle']
         world.click_link(tab_text)
+        world.wait_for(lambda _driver:title in world.browser.title)
         assert(title in world.browser.title)

lms/djangoapps/courseware/features/problems_setup.py

@@ -226,7 +226,6 @@ def answer_problem(problem_type, correctness):
 
         input_value = "8" if correctness == 'correct' else "5"
         choice = "choiceinput_0bc" if correctness == 'correct' else "choiceinput_1bc"
-        world.css_check(inputfield(problem_type, choice=choice))
         world.css_fill(
             inputfield(
                 problem_type,
@@ -234,6 +233,7 @@ def answer_problem(problem_type, correctness):
             ),
             input_value
         )
+        world.css_check(inputfield(problem_type, choice=choice))
 
 
 def problem_has_answer(problem_type, answer_class):