Fix typo in minamikata_hizuru and minamikata_ryuunosuke

BUR #11193 has been approved by @Hillside_Moose.

rename minamikata_hizuru -> minakata_hizuru
rename minamikata_ryuunosuke -> minakata_ryuunosuke

Minamikata is the wrong spelling. It should be Minakata for both of these characters.

Wikipedia:
https://ja.wikipedia.org/wiki/%E3%82%B5%E3%83%9E%E3%83%BC%E3%82%BF%E3%82%A4%E3%83%A0%E3%83%AC%E3%83%B3%E3%83%80

Manga source (page 23):
https://www.cmoa.jp/bib/speedreader/?cid=0000143087_jp_0003&u0=1&u1=0&rurl=https%3A%2F%2Fwww.cmoa.jp%2Ftitle%2F143087%2Fvol%2F3%2F&rb=0

The bulk update request #11193 (forum #216642) has been approved by @Hillside_Moose.