Remove <span class="title"> around Source link on dropdown

This fixes a bug where it would disappear if the screen width got too
narrow.

Author: jyn514

templates/rustdoc/topbar.html

@@ -76,8 +76,7 @@
                             {# A link to the release's source view #}
                             <li class="pure-menu-item">
                                 <a href="{{ crate_url | safe }}/source/" title="Browse source of {{ metadata.name }}-{{ metadata.version }}" class="pure-menu-link">
-                                    {{ "folder-open" | fas(fw=true) }}
-                                    <span class="title">Source</span>
+                                    {{ "folder-open" | fas(fw=true) }} Source
                                 </a>
                             </li>
                         </ul>