[BUGFIX] Correctly align datepicker clear input and trigger icon

This patch fixed the alignment of the clear input icon in the
date input fields and the trigger icon outside the datepicker input
fields.

Resolves: #59615
Releases: 6.3, 6.2
Change-Id: I0943ea0a8c4157d46fc07ca055ac8c1ab67c9a5b
Reviewed-on: https://review.typo3.org/30787
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters