Dont leak info on UpdateSpace

[kobergj]

There were some problems with the UpdateDrive func in decomposedfs when it is called without permission

• When calling with empty request it would leak the complete drive info
• When calling with non-empty request it would leak the drive name

Fixes owncloud/ocis#5030

[kobergj]

Additional information. Before this PR you could do this wonderful curl 🤣

    ~/:curl -k -s -u einstein:relativity -X PATCH 'https://localhost:9200/graph/v1.0/drives/1284d238-aa92-42ce-bdc4-0b0000009157$22ee9525-6c4a-4618-9bf9-79e94ba6fbfa' -d '{}' | jq .                                                                                                     
{                                                                                                                                                                                                                                                                                         
  "error": {                                                                                                                                                                                                                                                                              
    "code": "generalException",                                                                                                                                                                                                                                                           
    "innererror": {                                                                                                                                                                                                                                                                       
      "date": "2022-11-11T10:17:14Z",                                                                                                                                                                                                                                                     
      "request-id": "jkoberg-20ud0010ge/zLOo85G2EW-000002"                                                                                                                                                                                                                                
    },                                                                                                                                                                                                                                                                                    
    "message": "gateway could not call UpdateStorageSpace:rpc error: code = Unknown desc = error: not found: Blubbspace"                                                                                                                                                                  
  }                                                                                                                                                                                                                                                                                       
}

[micbar]

this two comment lines are leftovers