controlloop: fix capitalisation in AT configuration command
controlloop: fix capitalisation in AT configuration command

I was setting 'CONTROL:outdoor' rather than 'control:outdoor'. It
probably doesn't matter, but it is worth correcting.

rc500/ardrone_archive_aarons_laptop,rc500/ardrone_archive_aarons_laptop,rc500/ardrone_archive_aarons_laptop,rc500/ardrone_archive_aarons_laptop,rc500/ardrone_archive_aarons_laptop