### Preflight Checklist
<!-- Please ensure you've completed the following steps by replacing [ ] with [x]-->

* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 8.0.0
* **Operating System:**
  * Windows 10 Pro (1709)

### Expected Behavior
Using Notification API in main process with `timeoutType: 'never` I expected that the notification disappears only when the user clicks on it.  

### Actual Behavior
After few seconds the notification disappers.

### To Reproduce

```
  const newNotification = new Notification({title: 'I am a main process Notification!', timeoutType: 'never'})
  newNotification.show()
```

```sh
$ git clone https://github.com/p-fusi/electron-quick-start -b master
$ npm install
$ npm run start
```


shell/browser/notifications/win/windows_toast_notification.cc
return base::Environment::Create()->HasVar("ELECTRON_DEBUG_NOTIFICATIONS");
}
}  
ComPtr<ABI::Windows::UI::Notifications::IToastNotificationManagerStatics>
    WindowsToastNotification::toast_manager_;
ComPtr<ABI::Windows::UI::Notifications::IToastNotifier>
    WindowsToastNotification::toast_notifier_;
bool WindowsToastNotification::Initialize() {
  
  Windows::Foundation::Initialize(RO_INIT_MULTITHREADED);
  ScopedHString toast_manager_str(
      RuntimeClass_Windows_UI_Notifications_ToastNotificationManager);
  if (!toast_manager_str.success())
    return false;
  if (FAILED(Windows::Foundation::GetActivationFactory(toast_manager_str,
                                                       &toast_manager_)))
    return false;
  if (IsRunningInDesktopBridge()) {
    
    
    return SUCCEEDED(toast_manager_->CreateToastNotifier(&toast_notifier_));
  } else {
    ScopedHString app_id;
    if (!GetAppUserModelID(&app_id))
      return false;
    return SUCCEEDED(
        toast_manager_->CreateToastNotifierWithId(app_id, &toast_notifier_));
  }
}
WindowsToastNotification::WindowsToastNotification(