pwd: ignore non-option arguments, drop getcwd disabling from pwd-long test

[sylvestre]

No description provided.

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/date/date-locale-hour (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/pr/bounded-memory (fails in this run but passes in the 'main' branch)
Congrats! The gnu test tests/pwd/argument is no longer failing!
Congrats! The gnu test tests/pwd/pwd-long is no longer failing!
Note: The gnu test tests/dd/no-allocate is now being skipped but was previously passing.
Congrats! The gnu test tests/unexpand/bounded-memory is now passing!

[cakebaker]

Congrats! The gnu test tests/pwd/argument is no longer failing!
Congrats! The gnu test tests/pwd/pwd-long is no longer failing!

Kudos!