Fix off-by-one in Rakudo::Iterator.FirstNThenSinkAll
Fix off-by-one in Rakudo::Iterator.FirstNThenSinkAll

Introduced[^1] to implement close-with-limit feature in
IO::Handle.lines/IO::Path.lines/&lines and causes returned
Seq for this arg combination for those routine to be missing
last item.

[1] https://github.com/rakudo/rakudo/commit/90da80f6202d4b44e2bf6b

tbrowder/rakudo,raydiak/rakudo,rakudo/rakudo,sjn/rakudo,usev6/rakudo,awwaiid/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,nbrown/rakudo,MasterDuke17/rakudo,sjn/rakudo,labster/rakudo,rakudo/rakudo,jonathanstowe/rakudo,softmoth/rakudo,nbrown/rakudo,salortiz/rakudo,softmoth/rakudo,tbrowder/rakudo,rakudo/rakudo,lucasbuchala/rakudo,softmoth/rakudo,salortiz/rakudo,jonathanstowe/rakudo,rakudo/rakudo,Gnouc/rakudo,labster/rakudo,tbrowder/rakudo,labster/rakudo,Gnouc/rakudo,Gnouc/rakudo,Gnouc/rakudo,salortiz/rakudo,labster/rakudo,awwaiid/rakudo,nbrown/rakudo,sjn/rakudo,rakudo/rakudo,tony-o/rakudo,sjn/rakudo,sjn/rakudo,jonathanstowe/rakudo,tbrowder/rakudo,awwaiid/rakudo,raydiak/rakudo,lucasbuchala/rakudo,softmoth/rakudo,salortiz/rakudo,softmoth/rakudo,nbrown/rakudo,MasterDuke17/rakudo,raydiak/rakudo,nbrown/rakudo,rakudo/rakudo,Gnouc/rakudo,tony-o/rakudo,MasterDuke17/rakudo,labster/rakudo,tony-o/rakudo,usev6/rakudo,tony-o/rakudo,MasterDuke17/rakudo,labster/rakudo,raydiak/rakudo,jonathanstowe/rakudo,usev6/rakudo,awwaiid/rakudo,usev6/rakudo,tbrowder/rakudo,awwaiid/rakudo,lucasbuchala/rakudo,jonathanstowe/rakudo,tony-o/rakudo,MasterDuke17/rakudo,nbrown/rakudo,usev6/rakudo,salortiz/rakudo,tony-o/rakudo,salortiz/rakudo,Gnouc/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo