series: Use the user 'name' to display the reviewer

We don't only want the user login, but his/her name if available.

Signed-off-by: Damien Lespiau <damien.lespiau@intel.com>

patchwork/templates/patchwork/series.html

@@ -24,7 +24,7 @@ <h2>Details</h2>
   <tr>
     <th>Reviewer</th>
 {% if series.reviewer %}
-    <td>{{ series.reviewer }}</td>
+    <td>{{ series.reviewer.name }}</td>
 {% else %}
     <td><em class="text-muted">None</em></td>
 {% endif %}