[CLEANUP] Reformat IRRE JS code

This is an automatic reformat performed by PhpStorm, to get rid of some
ugly constructs like one-line inline methods.

Change-Id: Id24666c673b3822916f9c5233c0b34ce7d38e7aa
Related: #58475
Releases: 6.3
Reviewed-on: https://review.typo3.org/29833
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Andreas Wolf
Tested-by: Andreas Wolf