[BUGFIX] Use jQuery iterator for proper contextual variable handover

Use jQuery's each() method to handover variables from within the loop
to objects which are decoupled through jQuery's promise() method.

Resolves: #84826
Releases: master
Change-Id: I140a586b2fd6a0483d415d4618dfcf148a466dea
Reviewed-on: https://review.typo3.org/56771


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Björn Jacob <bjoern.jacob@tritum.de>
Tested-by: Björn Jacob <bjoern.jacob@tritum.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>