fix: Fix deferring ballots from the "edit position" view (ietf-tools#5106)

Fixes ietf-tools#4903

Author: larseggert

ietf/templates/doc/ballot/edit_position.html

@@ -43,11 +43,13 @@ <h1>
                     {% if ballot_deferred %}
                         <button type="submit"
                                class="btn btn-warning"
-                               name="Undefer">Undefer ballot</button>
+                               name="Undefer"
+                               value="Undefer">Undefer ballot</button>
                     {% else %}
                         <button type="submit"
                                class="btn btn-danger"
-                               name="Defer">Defer ballot</button>
+                               name="Defer"
+                               value="Defer">Defer ballot</button>
                     {% endif %}
                 {% endif %}
             {% endif %}