[BUGFIX] Add 'grep' to tapes.dm

[The Grim Sleeper]

So the 'grep' patch made it into the game.
But I forgot to update tapes.dm!!!
With this, it should show up in /bin as one of the available commands. (and therefore actually work!)

https://github.com/The-Grim-Sleeper/goon...6c27.patch