[enh] Remove autocreate plugin related settings, unused now
[enh] Remove autocreate plugin related settings, unused now

autosubscribe & autosubscribe2 are part of the autocreate plugin configuration.

Should have been removed with f36e4e2a837ae1947aa6f196622f5e3bed637a9
See https://github.com/YunoHost/yunohost-config-dovecot/pull/3

YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost