Align whimsymanteu spelling with whimsycorn.

Presently, there's some inconsistency across the whimsyverse about whether whimsymanteus start with "whimsi" or "whimsy". Given that the official [Whimsycorn](https://twitter.com/Whimsycorn) Twitter account opts for "whimsy", I propose that whimsymanteaus be aligned around that.

Thank you for your time.