Add normalizeHkApply to homogenize

Fixes some discrepancies in Tasty typing.

Author: odersky

src/dotty/tools/dotc/printing/PlainPrinter.scala

@@ -53,6 +53,8 @@ class PlainPrinter(_ctx: Context) extends Printer {
         case tp @ TypeRef(_, tpnme.hkApplyOBS) =>
           val tp1 = tp.reduceProjection
           if (tp1 eq tp) tp else homogenize(tp1)
+        case tp: RefinedType =>
+          tp.normalizeHkApply
         case tp: LazyRef =>
           homogenize(tp.ref)
         case _ =>