[BUGFIX] Fix list view functionality in FileList

This fixes several bugs in FileList:

1. Properly initializing the `searchTerm` ensures
   it is kept while sorting.
2. Sorting for "filesize" is now working properly,
   using corresponding collator attribute.
3. Pagination is properly reset on searching.
4. Correct search term is kept on paginating.

Resolves: #103053
Releases: main, 12.4
Change-Id: Ibf7dd278d13aed6142286d7408b9380588485801
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82850


Tested-by: core-ci <typo3@b13.com>
Tested-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>