[TASK] Clean up code in jsfunc.inline.js

There are some methods that are handled differently these days and
are not necessary anymore due to some IRRE refactorings in the last
months.

Resolves: #80446
Releases: master
Change-Id: Icadfbfda1c1471c547dc1dbcaad989fb1a623b66
Reviewed-on: https://review.typo3.org/52158


Reviewed-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: Frank Nägler <frank.naegler@typo3.org>
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>