Remove useless JS cookie deletion that isn't working

front/src/store/auth.js

@@ -86,10 +86,6 @@ export default {
       }, response => {
         // we cannot contact the backend but we can at least clear our local cookies
         logger.default.info('Backend unreachable, cleaning local cookies…')
-        if (document) {
-          // this is to ensure we do not have any cookie set by django
-          document.cookie = 'Path=/; Expires=Thu, 01 Jan 1970 00:00:01 GMT;'
-        }
       }).finally(() => {
         logger.default.info('Log out, goodbye!')
         router.push({name: 'index'})