[BUGFIX] Streamline UX for File Upload module

[BUGFIX] Streamline UX for File Upload module

When using the file upload module (called via File list), the dialog uses
non-bootstrap classes from historical times back in the day.

Using proper HTML makes the view look more like the rest of
TYPO3 Backend.

Resolves: #87178
Releases: master, 9.5
Change-Id: I4d6a4c8f96414d5fb776270db6ef8aa677e788b7
Reviewed-on: https://review.typo3.org/59175
Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Markus Klein <markus.klein@typo3.org>
Tested-by: Markus Klein <markus.klein@typo3.org>