[APPROVED] Mass update: guilty_gear_2020 -> guilty_gear_strive

BUR #2168 has been approved by @evazion.

mass update guilty_gear_2020 -> guilty_gear_strive

Reason: Official name of this in-development game, as revealed a short while ago.

EDIT: The bulk update request #2168 (forum #161017) has been approved by @evazion.

The bulk update request #2168 (forum #161017) has been approved by @evazion.