CSS updates

- Add template for filter lists
- Filter lists now layout horizontally
- Change flex-row to flex-wrap

InvenTree/templates/stock_table.html

@@ -67,9 +67,7 @@
             {% endif %}
             {% endif %}
             {% endif %}
-            <div class='filter-list' id='filter-list-stock'>
-                <!-- An empty div in which the filter list will be constructed -->
-            </div>
+            {% include "filter_list.html" with id="stock" %}
         </div>
     </div>
 </div>