PARTYNEXTDOOR has officially toured.Thankfully, the popular R&B star will rectify that slight when he takes off on his nationwide ‘Sorry I’m Outside Tour’ this summer.From June through August, the “Break From Toronto” singer is slated to headline at concerts and festivals all over the U.S. and Canada in support of his recently released “PARTYNEXTDOOR4” album.That includes a pair of back-to-back gigs at Brooklyn’s brand new Paramount Theatre on Thursday, Aug.