Fix #293

[troglodyne]

Don't unlink during END for your tempfile when a tempdir is already set to cleanup in END and passed in as the workdir.

Possibly I could be more intelligent about this and maybe check if workdir is not matching ^yath- (set by App::Yath::Tester), but thus far I don't yet see a context where this wouldn't be true, so it just doesn' seem worth checking for.

[troglodyne]

Leaving some notes here on things I've noticed thus far when trying to add a test for this but I'm getting tired:
I need to find a way to force Collector.pm's setup_child_input to have +TEST_SETTINGS with an input instead of input_file, as that's the route where this bug triggers. I'm guessing this involves forcing the App::Yath::Tester::yath invocation to have args that force usage of that so that we need to setup the input-$$-XXXX file there.

[exodist]

I do not think this needs extra testing, I think this fix is fine.