Remove/Change qualifiers from Senpai ga Uzai characters

BUR #36091 has been approved by @evazion.

create alias igarashi_futaba_(shiromanta) -> igarashi_futaba
create alias takeda_harumi_(shiromanta) -> takeda_harumi
create alias kurobe_natsumi_(shiromanta) -> kurobe_natsumi
create alias tsukishiro_mona_(shiromanta) -> tsukishiro_mona

These characters' names are not ambiguous, and probably only have these qualifiers to show they're original Shiromanta characters. Now that they have their own anime and everything, it's about time these got removed.

BUR #36093 has been approved by @evazion.

create alias sakurai_yuuto_(shiromanta) -> sakurai_yuuto_(senpai_ga_uzai)
create alias grandpa_(shiromanta) -> grandpa_(senpai_ga_uzai)
create alias hijikata_(shiromanta) -> hijikata_(senpai_ga_uzai)
create alias ooishi_(shiromanta) -> ooishi_(senpai_ga_uzai)
create alias tanaka_(shiromanta) -> tanaka_(senpai_ga_uzai)
create alias satou_(shiromanta) -> satou_(senpai_ga_uzai)
create alias shige_(shiromanta) -> shige_(senpai_ga_uzai)
create alias shimizu_(shiromanta) -> shimizu_(senpai_ga_uzai)

As for the potentially ambiguous ones, I think this will be a better qualifier. This leaves Katou-chan (shiromanta), who doesn't seem to have any connection aside from the artist and a few cameos, it looks like.

The bulk update request #36091 (forum #332881) has been approved by @evazion.

The bulk update request #36093 (forum #332884) has been approved by @evazion.