GUI: allow deleting external peers from client list

gui/templates/index.html

@@ -28,7 +28,10 @@
             <button type="submit" class="danger">Удалить</button>
           </form>
         {% else %}
-          -
+          <form method="post" action="{{ url_for('peer_delete_by_key') }}" style="display:inline" onsubmit="return confirm('Удалить peer?')">
+            <input type="hidden" name="public_key" value="{{ p.public_key }}" />
+            <button type="submit" class="danger">Удалить</button>
+          </form>
         {% endif %}
       </td>
     </tr>