nl: show allowed range when -i/-l negative_num is given

[oech3]

Closes #14314

We don't need to manually parse it just for showing valid range:

> target/debug/nl -i -5 f
error: invalid value '-5' for '--line-increment <NUMBER>': -5 is not in 0..9223372036854775807

For more information, try '--help'.

[oech3]

GNU actually accepts negative value.

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/nl/nl. tests/nl/nl is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/date/resolution (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/tail/tail-n0f (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/cut/bounded-memory (passes in this run but fails in the 'main' branch)
Skipping an intermittent issue tests/date/date-locale-hour (passes in this run but fails in the 'main' branch)
Skip an intermittent issue tests/pr/bounded-memory (was skipped on 'main', now failing)