[Toybox] [PATCH] rm: error message consistency.

[enh]

Before:

  $ ./rm
  rm: Needs 1 argument
  $ ./rmdir
  rmdir: Needs 1 argument (see "rmdir --help")

After:

  $ ./rm
  rm: Needs 1 argument (see "rm --help")
---
 toys/posix/rm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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