A leftover old-school AJAX handler
with an invalid endpoint (pointing to an actual
Cleaner Scheduler Task) was removed.

Resolves: #73351
Releases: master, 7.6
Change-Id: I953a50e7d381e894cc473e6bab1fbb854551bf5c
Reviewed-on: https://review.typo3.org/46605


Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Wouter Wolters <typo3@wouterwolters.nl>
Tested-by: Wouter Wolters <typo3@wouterwolters.nl>