feat: remove usage of .last

app/javascript/dashboard/store/modules/specs/conversations/getters.spec.js

@@ -1,4 +1,3 @@
-import commonHelpers from '../../../../helper/commons';
 import getters from '../../conversations/getters';
 /*
   Order of conversations in the fixture is as follows:
@@ -9,9 +8,6 @@ import getters from '../../conversations/getters';
 */
 import conversations from './conversations.fixtures';
 
-// loads .last() helper
-commonHelpers();
-
 describe('#getters', () => {
   describe('#getAllConversations', () => {
     it('returns conversations ordered by lastActivityAt in descending order if no sort order is available', () => {