Fix a bug where some entries included the prompt text

Once we set the griddler reply delimiter correctly, it throws out everything we don't want.

This should make us immune to email client differences that aren't handled in griddler's default regexen.
Oops, didn't see this before merging.

Yes, you're correct about what we're testing. I could reword this in the positive direction to something like "and it returns the body above the prompt" or something.