Fix Java TASTy of scala module class references

[bishabosha]

For some definitions

package p

object Module

public class J {
  public p.Module$ module() {
    return p.Module$.MODULE$;
  }
}

When the tree for J reaches TASTy (using -Yjava-tasty -Yjava-tasty-output foo.jar), this looks like

    87:       DEFDEF(12) 16 [module]
    90:         EMPTYCLAUSE
    91:         SELECTtpt 17 [Module$]
    93:           SHAREDtype 3
    95:         ELIDED
    96:           TYPEREF 19 [Module[ModuleClass]]
    98:             SHAREDtype 3
   100:         STATIC

really, tree 91 should be SELECTtpt 19 [Module[ModuleClass]]. This relies on the compiler (aka all TASTy clients) intrinsically knowing how to resolve Module$ when the definition is actually Module[ModuleClass]

Originally posted by @bishabosha in #19773 (comment)