[BUGFIX] Fix undefined variable $applicationContext in Bootstrap.php

Resolves: #86235
Releases: master
Change-Id: I1e75309abd8bc1aa38d861dae4a48a958b9750dd
Reviewed-on: https://review.typo3.org/58256


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Helmut Hummel <typo3@helhum.io>
Tested-by: Helmut Hummel <typo3@helhum.io>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>