fix: variable operator id variable name

lib/operator.js

@@ -1,8 +1,10 @@
 const db = require('./db')
+const _ = require('lodash/fp')
 
 function getOperatorId (service) {
   const sql = `SELECT operator_id FROM operator_ids WHERE service = '${service}'`
   return db.oneOrNone(sql)
+    .then(_.mapKeys(_.camelCase))
 }
 
 module.exports = { getOperatorId }