Fix dependent function type test

Previously the `implicitly[C]` was refining its return type of `ev` by inlining.
As we are now inlining after typer we refine the return type explicitly to `ev.type`.

Author: nicolasstucki

tests/disabled/pos/depfuntype.scala renamed to tests/pos/depfuntype.scala

@@ -19,7 +19,7 @@ object Test {
   // Reproduced here because the one from DottyPredef is lacking a Tasty tree and
   // therefore can't be inlined when testing non-bootstrapped.
   // But inlining `implicitly` is vital to make the definition of `ifun` below work.
-  inline final def implicitly[T](implicit ev: T): T = ev
+  inline final def implicitly[T](implicit ev: T): ev.type = ev
 
   type IDF = implicit (x: C) => x.M