Remove accidental double-rendering of content sources from Differential

Summary: Oops, I left this in from an earlier version and missed it since I was
mostly looking at Maniphest for testing. We already render this information in
the header, don't additionally render it under the comments.

Test Plan: derp derp, loaded any revision with sourced comments

Reviewers: jungejason, tuomaspelkonen, aran

Reviewed By: jungejason

CC: aran, jungejason

Differential Revision: 871

src/applications/differential/view/revisioncomment/DifferentialRevisionCommentView.php

@@ -285,7 +285,6 @@ final class DifferentialRevisionCommentView extends AphrontView {
           '</div>'.
           $inline_render.
         '</div>'.
-        $content_source->render().
       '</div>');
   }