ls: fixed incorrect alignment when using --classify option

[lukasx999]

Removing the insertion of tabs instead of spaces when using the --classify or -F option seems to fix the mentioned issue. All of the tests pass, except for one, which obviously checks for tabs, which my fix changed.

It seems to me that the uutils_term_grid crate cannot properly align columns when using tabs as text.

With the fix, sometimes the alignment differs from the GNU implementation of ls, but I don't know how much of an issue that is.

fixes #7526

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/ls/stat-dtype. tests/ls/stat-dtype is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/misc/stdbuf (passes in this run but fails in the 'main' branch)

[emar-kar]

Yeah, but this breaks #5396 , which required this change to be introduced

[sylvestre]

is it still relevant ? thanks

[tertsdiepraam]

It's outdated due to #7616. Thanks for the contribution though!