[templates] Use TMDB rating ID if available

vrobbler/templates/videos/video_detail.html

@@ -57,6 +57,7 @@ dd {
 <div class="row header">
     <div class="cover image-wrapper">
         {% if object.imdb_rating %}<div class="caption">{{object.imdb_rating}}</div>{% endif %}
+        {% if object.tmdb_rating %}<div class="caption">{{object.tmdb_rating}}</div>{% endif %}
         <img src="{% if object.cover_image %}{{object.cover_image.url}}{% else %}{% static 'images/no-video-cover.jpg' %}{% endif %}" width="400px" />
         <div class="caption-footer">{{object.year}}{% if object.tv_series %} | <b>S</b>{{object.season_number}} <b>E</b>{{object.episode_number}}{% endif %}</div>
     </div>