Fix Api ReferenceErrors

app/assets/javascripts/admin_email_select.js

 /* eslint-disable no-var, wrap-iife, func-names, space-before-function-paren, camelcase, no-unused-vars, quotes, object-shorthand, one-var, one-var-declaration-per-line, prefer-arrow-callback, comma-dangle, prefer-template, no-else-return, yoda, prefer-rest-params, prefer-spread, max-len */
-/* global Api */
+import Api from './api';
 
 var slice = [].slice;
 

app/assets/javascripts/approvers_select.js

-/* global Api */
+import Api from './api';
 
 export default class ApproversSelect {
   constructor() {

app/assets/javascripts/ldap_groups_select.js

 /* eslint-disable space-before-function-paren, prefer-arrow-callback, no-var, one-var, one-var-declaration-per-line, object-shorthand, quotes, comma-dangle, consistent-return, no-unused-vars, padded-blocks, func-names, max-len */
-/* global Api */
+import Api from './api';
 
 (function() {
   $(function() {