[TASK] Pass targetElement explicitly for RegularEvent.delegateTo

Arrow functions keep using their own `thisArg` on invocation. To
be able to avoid unscoped `function()` call and still retrieving
`targetElement` it is passed explicitly as 2nd callback argument.

Resolves: #91084
Releases: master
Change-Id: I3f1087713827605ac8b59f18eb4a59becd67e460
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64209


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>