Romanization change: alias mushoku_tomei_sai -> mushoku_toumeisai

BUR #53899 has been approved by @evazion.

create alias mushoku_tomei_sai -> mushoku_toumeisai

This would be the proper romanization of the event's title. 透 is read with a long vowel and "sai" shouldn't be separated (see: Reitaisai).

The bulk update request #53899 (forum #415164) has been approved by @evazion.