[SWAPI] Control details does not contain the right formats

[mdhsl]

The Control route does not return the right format. Actually, the route https://ogct17.georobotix.io:8443/sensorhub/api/systems/1ghd3h0dea3xy/controls?format=application/json should return only 'application/json'

[alexrobin]

Fixed in 96f84e31