[Toybox] [PATCH] grep: add missing flags to usage line.

[enh]

Since this is my second attempt over a fairly short period of time,
I'm not 100% confident this is really all of them -- and this casts
doubt on the other toys I checked too! -- but until the machines
take over this task, meatbots like me will have to keep trying...
---
 toys/posix/grep.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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