Sortable list table column header text is higher than non-sortable headers

[helen]

See screenshot - it's a not-always-noticeable one pixel difference. Previously: #26131.

[helen]

With custom column, which emphasized the issue

[drozdz]

Patch

[metodiew]

Before and after

[metodiew]

It was hard to notice that there is a difference. I tested the patch with Chrome and it works for me.

[wonderboymusic]

In 34276:

List Tables: ensure that sortable list table column headers have the same padding/line-height as non-sortable headers.

Props drozdz.
Fixes #27945.

[afercia]

Looks like the increased left and right padding breaks the sort arrow alignment in some tables, see for example the Categories one in the screenshot below:

[wonderboymusic]

In 34892:

List Tables: after [34276], decrease horizontal padding for sorted column headers (causing weirdness in the Count column of tax list tables) - the vertical padding change suffices in fixing the original issue.

Fixes #27945.