Remove nested block

The idea of adding that block was to have the ability to remove transcodes. I'll create another PR to solve that issue.

wagtailvideos/templates/wagtailvideos/videos/edit.html

@@ -78,7 +78,6 @@
             </div>
         </div>
         <div class="row" style='margin-top: 2em;'>
-        {% block transcode %}
         {% if can_transcode %}
             <h2 class="u-text-transform-uppercase">{% trans "Transcodes" %}</h2>
             <p>{% trans "If you wish to generate HTML5 compliant transcodes use the form below. This may take a while depending on the length of the video." %}</p>
@@ -116,7 +115,6 @@
             <br/><br/>
             <span class='transcode-error'>{% trans "Ffmpeg is not found on your server. Please install if you wish to transcode videos into an HTML5 video compliant format." %}</span>
         {% endif %}
-        {% endblock %}
         {% if tracks_action_url %}
             <h2 class="u-text-transform-uppercase">{% trans "Tracks" %}</h2>
             <p>{% trans 'You can add/edit subtitles or accessibility captions for this video. For information about the filetype that should be used see the mozilla docs on <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebVTT_API">WebVTT</a>' %}</p>