get updated cipher and used that in the response model (#4030)

(cherry picked from commit cb55699)

src/Api/Vault/Controllers/CiphersController.cs

@@ -573,8 +573,9 @@ public async Task<CipherDetailsResponseModel> PutCollections(Guid id, [FromBody]
  await _cipherService.SaveCollectionsAsync(cipher,
  model.CollectionIds.Select(c => new Guid(c)), userId, false);
 
+ var updatedCipher = await GetByIdAsync(id, userId);
  var collectionCiphers = await _collectionCipherRepository.GetManyByUserIdCipherIdAsync(userId, id, UseFlexibleCollections);
- return new CipherDetailsResponseModel(cipher, _globalSettings, collectionCiphers);
+ return new CipherDetailsResponseModel(updatedCipher, _globalSettings, collectionCiphers);
  }
 
  [HttpPut("{id}/collections-admin")]