Remove duplicated tag_feas assignment in create route (api/apps/chunk_app.py) (#12392)

### What problem does this PR solve?

This PR removes a duplicated assignment of `tag_feas` in the
`@manager.route('/create')` API handler located in
`api/apps/chunk_app.py`.

The same conditional block was unintentionally repeated twice, which had
no
functional impact but reduced code readability and maintainability.
This change eliminates the redundancy while preserving existing
behavior.

### Type of change

- [x] Refactoring

Co-authored-by: 김경만 <kmkim7@humaxit.com>

api/apps/chunk_app.py

@@ -260,8 +260,6 @@ async def create():
     d["create_timestamp_flt"] = datetime.datetime.now().timestamp()
     if "tag_feas" in req:
         d["tag_feas"] = req["tag_feas"]
-    if "tag_feas" in req:
-        d["tag_feas"] = req["tag_feas"]
 
     try:
         def _create_sync():