Cmd + R does not refresh page from Insufficient Permissions error page

As noted in NIFI-2917, the browser keyboard shortcuts for Refresh were being intercepted by NiFi, but when the application is down and an error screen is displayed, these were not being released through to the browser to reload the application. While this was fixed for a majority of scenarios, in the event that the "Insufficient Permissions" error is encountered and then the app is stopped, permissions resolved, and restarted, the Refresh command is not released to the browser to refresh the page.