Fix issue with Blackblaze cloud credentials labels in new UI

I am unable to add new Backblaze cloud credentials.

Steps:

In FreeNAS UI (System -> Cloud Credentials):

1. Press "Add"
2. Select "Backblaze B2"
3. Enter all fields using your app key ID and master app key (from Backblaze)
4. Press Save
5. Navigate in UI: Tasks ->Cloud Sync Tasks
6. Press "Add"
7. Select the dropdown for the "credential field" and select your creds from step 3.

Results:

Error: 14

[EFAULT] 2019/08/22 18:15:41 Failed to create file system for "remote:": failed to authorize account: failed to authenticate: Unknown 401 (401 bad_auth_token)