Delete the dead listfacilitylearners from setup_wizard

No caller anywhere in kolibri/ or packages/, and a line-for-line duplicate of
FacilityUserResource.listRemoteFacilityLearners, which ImportIndividualUserForm
already calls. Its removal takes the last client/urls imports with it.

Author: rtibblesbot

kolibri/plugins/setup_wizard/frontend/api.js

@@ -1,5 +1,3 @@
-import client from 'kolibri/client';
-import urls from 'kolibri/urls';
 import { Resource } from 'kolibri/apiResource';
 
 /**
@@ -45,19 +43,4 @@ export const FacilityImportResource = new Resource({
     const response = await this.request({ action: 'facilityadmins' });
     return response.data;
   },
-  async listfacilitylearners(params) {
-    const { data } = await client({
-      url: urls['kolibri:core:remotefacilityauthenticateduserinfo'](),
-      method: 'POST',
-      data: params,
-    });
-
-    const admin = data.find(user => user.username === params.username);
-    const students = data.filter(user => !user.roles || !user.roles.length);
-
-    return {
-      admin,
-      students,
-    };
-  },
 });