fix checkouts sorting

Author: odeimaiz

services/web/server/src/simcore_service_webserver/licenses/_models.py

@@ -68,12 +68,9 @@ class LicensedItemsPurchasesPathParams(StrictRequestParameters):
     RequestParameters
 ] = create_ordering_query_model_class(
     ordering_fields={
-        "purchased_at",
-        "modified_at",
-        "name",
+        "started_at",
     },
-    default=OrderBy(field=IDStr("purchased_at"), direction=OrderDirection.DESC),
-    ordering_fields_api_to_column_map={"modified_at": "modified"},
+    default=OrderBy(field=IDStr("started_at"), direction=OrderDirection.DESC),
 )