Ensure are you still there dialog is closed before showing logging out page

[richard-cox]

• fixes 'Are you logged in' dialog seen on logging out page #4468
• Tested by.... src/frontend/packages/core/src/logged-in.service.ts

   this._promptInactiveUser(Date.now() + (1 * 1000 * 10));
   this.closeSessionCheckerPoll();
   // if (aboutToExpire) {
   //   const idleDelta = now - this.lastUserInteraction;
   //   const userIsActive = idleDelta < this.userIdlePeriod;
   //   const pageVisible = new PageVisible(document);
   //   if ((!dashboardState.timeoutSession && pageVisible.isPageVisible()) || userIsActive) {
   //     this.store.dispatch(new VerifySession(false, false));
   //   } else {
   //     this._promptInactiveUser(safeExpire);
   //     this.closeSessionCheckerPoll();
   //   }
   // }
  

[nwmac]

LGTM