Simplify wip test.

* No records are kept for a work in progress PR (status.txt)
* `wip` should not be part of a word, e.g. _"wipe"_

**my 2 cents:** I'm not in favour of _work-in-progress_ pull requests, but that's your call. The goal of one is not to say _"I'm working on something"_ but rather _"here is what I did, check it out."_