Fixed array to string conversion notice

Closes #3273045

modules/jsonapi_search_api_facets/src/Plugin/facets/url_processor/JsonApiQueryString.php

@@ -201,7 +201,7 @@ class JsonApiQueryString extends QueryString {
           $child_ids = $facet->getHierarchyInstance()->getNestedChildIds($result->getRawValue());
           $parents_and_child_ids = array_merge($parent_ids, $child_ids);
           foreach ($parents_and_child_ids as $id) {
-            $filter_params = array_diff($filter_params, [$id]);
+            $filter_params[$this->urlAlias] = array_diff($filter_params[$this->urlAlias], [$id]);
           }
         }
         // Exclude currently active results from the filter params if we are in