SI-7643 Enable newPatternMatching in interactive.

Without it, the enclosed test fails with:

    ArrayBuffer(Problem(RangePosition(partial-fun/src/PartialFun.scala, 62, 62, 77),type mismatch;
     found   : Int => Int
     required: PartialFunction[Int,Int],2))

And with that, we can remove this option altogether.
Merge pull request #2912 from retronym/ticket/7643

SI-7643 Enable newPatternMatching in interactive.