Stigmatized witch can't merge with aeon

[karlmarxman]

Didn't get the option to merge.

[vikigenius]

Haven't reproduced this, but this is possibly a bug if Stigmatized Witch has a separate different spellbook than a standarrd witch.

But since I don't play the game anymore, it will take a while for me to get around this. But would welcome any PRs on this.