fix dict format for common words

handler.py

@@ -169,7 +169,7 @@ class Transcript:
                 {'text': word, 'value': student_dict[word], 'category': 'student'})
         sorted_dict_list = sorted(dict_list, key=lambda x: x['value'], reverse=True)
         sorted_uptake_dict_list = sorted(uptake_dict_list, key=lambda x: x['value'], reverse=True)
-        return {'common_top_words': sorted_dict_list[:50]}, {'uptake_top_words':sorted_uptake_dict_list[:50]}
+        return sorted_dict_list[:50], sorted_uptake_dict_list[:50]
 
     def get_talk_timeline(self):
         return [utterance.to_talk_timeline_dict() for utterance in self.utterances]