[TASK] Remove unused TimeTracker->fixContent() method argument

The protected method TimeTracker->fixContent() has an argument $first
which is always set to "0", so the functionality can be removed.

Resolves: #85967
Releases: master
Change-Id: I4fbe73bd6d15b892dcc21b1cdd4456af4f80eeb3
Reviewed-on: https://review.typo3.org/58025


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>