Fix: parent child config (#14199)

### What problem does this PR solve?

Correctly set and display parent-child config in parser_config, and
allow to pass `tenant_id` in PATCH `/api/v1/chats`.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/hooks/use-knowledge-request.ts

@@ -322,15 +322,12 @@ export const useUpdateKnowledge = (shouldFetchList = false) => {
       filename_embd_weight,
       task_page_size,
       pages,
-      parent_child:
-        children_delimiter !== undefined ||
-        use_parent_child !== undefined ||
-        enable_children !== undefined
-          ? {
-              children_delimiter,
-              use_parent_child: use_parent_child ?? enable_children,
-            }
-          : undefined,
+      parent_child: enable_children
+        ? {
+            children_delimiter,
+            use_parent_child: use_parent_child ?? enable_children,
+          }
+        : undefined,
       ext: { ...ext, ...parserExt },
     };
   };