[Toybox] [PATCH] grep: use TOYFLAG_ARGFAIL for grep too.

[enh]

Also add a test, and add a test for timeout now it's been fixed.
---
 tests/grep.test    | 2 ++
 tests/timeout.test | 1 +
 toys/posix/grep.c  | 8 ++++----
 3 files changed, 7 insertions(+), 4 deletions(-)
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