fix a potential conflict with delayed verification of confusable names
fix a potential conflict with delayed verification of confusable names

0. Enable email verification
1. Register `dog`
2. Register `d0g`
3. Verify `dog`
4. Verify `d0g`: verification succeeds but the nick cannot be used

oragono/oragono,DanielOaks/oragono,DanielOaks/oragono,oragono/oragono,oragono/oragono