Implication: eternal_return:_black_survival -> black_survival

BUR #8464 has been approved by @nonamethanks.

create implication eternal_return:_black_survival -> black_survival

Since they are both the same universe, and Eternal Return is a spinoff of the original Black Survival, the implication makes sense.

The bulk update request #8464 (forum #203366) has been approved by @nonamethanks.

Necrobumping this to ask if we really need to make a distinction between these two games. The wiki says that Black Survival shut down and was replaced by Eternal Return: Black Survival, which has the same characters and setting. It seems like another Princess Connect! vs Princess Connect! Re:Dive situation.

The official name also appears to be just Eternal Return now (see https://en.wikipedia.org/wiki/Eternal_Return_(video_game)).