Tag Alias: kanryuusai_sensei -> takeda_kanryuusai

Aliasing kanryuusai_sensei -> takeda_kanryuusai.

Reason: Name is given as 武田還流斎

I haven't seen his name reading given, so I'm just keeping consistent with the old tag on the given name (not sure if it's certain).

Edit: I'm an idiot.

Done.