series: Make sure submitter and reviewer names don't wrap

The series name is the columns supposed to shrink. Make sure the table
layout algorithm isn't going to decide to split people's names on two lines.

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

patchwork/templates/patchwork/series-list-table.html

@@ -17,8 +17,8 @@
     <th data-dynatable-no-sort="true">Series</th>
     <th data-dynatable-no-sort="true">Tests</th>
     <th data-dynatable-no-sort="true">Patches</th>
-    <th data-dynatable-no-sort="true">Submitter</th>
-    <th data-dynatable-no-sort="true">Reviewer</th>
+    <th data-dynatable-no-sort="true" class="text-nowrap">Submitter</th>
+    <th data-dynatable-no-sort="true" class="text-nowrap">Reviewer</th>
     <th class="text-nowrap">Updated</th>
   </tr>
 </thead>