update spec to fix unknown variables (#3062)
update spec to fix unknown variables (#3062)

merge of https://github.com/zooniverse/Panoptes/pull/3017 left some 
differently named variables in the spec
camallen/Panoptes,zooniverse/Panoptes,camallen/Panoptes,zooniverse/Panoptes,zooniverse/Panoptes,zooniverse/Panoptes,camallen/Panoptes,camallen/Panoptes