fs: update rm/rmdir validation messages

The validation code for the rm/rmdir functions treated the
options as distinct parameters instead of the options properties
that they are. This commit updates the validation to treat them
like properties.

PR-URL: https://github.com/nodejs/node/pull/35565


Reviewed-By: Ben Coe <bencoe@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Denys Otrishko <shishugi@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Masashi Hirano <shisama07@gmail.com>