use blue for exit code 0

[frolic]

I have a few init scripts I run as part of mprocs and found the red color a little misleading, so I thought it would be nice to use a different color for exit code 0 specifically.

I also considered change the status message to "DONE" or similar, but wasn't sure your opinions on that.

Looks like this:

(This is my first time writing Rust and very happy for any/all feedback!)