Rename and recategory Satono Diamond's second official alternate costume

BUR #19563 has been rejected.

rename satono_diamond_(chevalier_bull)_(umamusume) -> satono_diamond_(chevalier_bleu)_(umamusume)
category satono_diamond_(chevalier_bull)_(umamusume) -> character

"Chevalier bull" doesn't make sense. The Japanese word "シュヴァリエ・ブル" (shuvarie buru) should be transcribed "chevalier bleu", which means "blue knight" in French.

second line of the BUR is redundant, as the tag is already a chartag

Only because it was updated after the BUR was made.

And now the BUR is redundant because the user who created the original 'misspelled' tag just manually renamed it.

The bulk update request #19563 (forum #252516) has been rejected by @nonamethanks.