[BUGFIX] Follow-up: .t3-table & .dblist-table

Fixes different headers and columns paddings for .t3-table
and the former .typo3-dblist. Also fixes .row-header link
hover style where text links went black and dark gray.

Resolves: #56926
Releases: 6.2
Change-Id: I0e93ccc315f4740b87be7656df1d54cd40272be7
Reviewed-on: https://review.typo3.org/28406
Reviewed-by: Marcin Sągol
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers
Reviewed-by: Wouter Wolters
Tested-by: Wouter Wolters