Update advertisement model to use modern syntax.
Update advertisement model to use modern syntax.

nanaya/moebooru,nanaya/moebooru,moebooru/moebooru,moebooru/moebooru,nanaya/moebooru,euank/moebooru-thin,moebooru/moebooru,nanaya/moebooru,moebooru/moebooru,moebooru/moebooru,euank/moebooru-thin,nanaya/moebooru,euank/moebooru-thin,euank/moebooru-thin,euank/moebooru-thin