[TASK] Update localization rendering tests to newest Testing Framework

addTypoScriptToTemplateRecord method was added to FunctionalTestCase.php
in Testing Framework.
So we can remove it from test cases.
Fix two other gremlins also (unneeded comment and unused variable).

Resolves: #82401
Releases: master, 8.7, 7.6
Change-Id: I8144bae5a807d60123ef5228a44eba579a7705c7
Reviewed-on: https://review.typo3.org/54060


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Tymoteusz Motylewski <t.motylewski@gmail.com>
Tested-by: Tymoteusz Motylewski <t.motylewski@gmail.com>