fix: do not always set classification to false

[kjappelbaum]

hi @sgbaird 👋🏽

Thanks for packaging this up. I think this fix here is needed (perhaps one should also add a simple test that overfits to check that it does what it is supposed to do).

Cheers,
Kevin

[sgbaird]

Oh wow, great catch! Yeah, that definitely looks like the right fix. I haven't dealt too much with classification and CrabNet, and adding a unit test seems to be in order here. I'll go ahead and merge the request for now.