Changed tenor config API key name
Changed tenor config API key name

refs https://github.com/TryGhost/Team/issues/1237#issuecomment-981770688

- API key names for external services now follow a standard pattern
  - top-level key of the service name
  - public/private and read/write perms inside the name, eg. `publicReadOnlyApiKey`
- updated test to match expected API key name

TryGhost/Ghost,ErisDS/Ghost,TryGhost/Ghost,ErisDS/Ghost,TryGhost/Ghost,e10/Ghost,ErisDS/Ghost,e10/Ghost