Update ps_facetedsearch.php

The fixed filters are 7 and not 6, and they are as follows:
1. Sub-categories filter
2. Product stock filter
3. Product extras filter
4. Product condition filter
5. Product brand filter
6. Product weight filter (slider)
7. Product price filter (slider)

ps_facetedsearch.php

@@ -873,7 +873,7 @@ public function renderAdminTemplateEdit($template = null)
             'attribute_groups' => $attributeGroups,
             'features' => $features,
             'filters' => $filters,
-            'total_filters' => 6 + count($attributeGroups) + count($features),
+            'total_filters' => 7 + count($attributeGroups) + count($features),
             'default_filters' => $this->getDefaultFilters(),
             'categories_tree' => $treeCategoriesHelper->render(),
             'controller_options' => $controller_options,