Missed 2 housamo renames

BUR #8570 has been approved by @evazion.

rename tanngrisnir_(tokyo_houkago_summones) -> tanngrisnir_(housamo)
rename mephistopheles_(tokyo_after_school_summoners) -> mephistopheles_(housamo)

Missed these from topic #19834

As small as these tags are, you really didn't need a BUR just to rename them. I highly doubt anyone would get upset with you for simply updating them via tag script.

The bulk update request #8570 (forum #203901) has been approved by @evazion.