Simplify calls to render partial

We're also adding a bit of consistency, since most of our calls to
partial rendering omit the `partial` and `locals` keys.

app/views/legislation/annotations/show.html.erb

@@ -42,9 +42,9 @@
           </aside>
         </div>
 
-      <%= render partial: "/comments/comment_tree", locals: { comment_tree: @comment_tree,
-                                                              comment_flags: @comment_flags,
-                                                              display_comments_count: true } %>
+      <%= render "/comments/comment_tree", comment_tree: @comment_tree,
+                                           comment_flags: @comment_flags,
+                                           display_comments_count: true %>
       </div>
     </div>
   </div>