[BUGFIX] Update tslint to 5.9.1 and fix syntax issue in Login.ts

Resolves: #83537
Releases: master
Change-Id: I8da8f31447bd2ca73aa7d7c22a929b918a085da8
Reviewed-on: https://review.typo3.org/55332


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Tested-by: Stefan Neufeind <typo3.neufeind@speedpartner.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>