Revert "Reallow ill-kinded but JavaDefined parents (scala#5010)"

This reverts commit 1fe1232 as it was an
incorrect diagnosis.
The only existing testcase was written when AbstractListModel had no parameter,
so change the testcase instead.

We could alternatively infer type arguments (see scala/bug#11111), but that
seems typically unhelpful.

Author: Blaisorblade

compiler/src/dotty/tools/dotc/typer/Typer.scala

@@ -1524,8 +1524,7 @@ class Typer extends Namer
         ctx.error(i"$psym is extended twice", tree.pos)
       seenParents += psym
       if (tree.isType) {
-        if (!psym.is(JavaDefined))
-          checkSimpleKinded(result) // Not needed for constructor calls, as type arguments will be inferred.
+        checkSimpleKinded(result) // Not needed for constructor calls, as type arguments will be inferred.
         if (psym.is(Trait) && !cls.is(Trait) && !cls.superClass.isSubClass(psym))
           result = maybeCall(result, psym, psym.primaryConstructor.info)
       }

tests/run/t3613.scala

@@ -2,7 +2,7 @@ class Boopy {
     private val s = new Schnuck
     def observer : PartialFunction[ Any, Unit ] = s.observer
 
-    private class Schnuck extends javax.swing.AbstractListModel {
+    private class Schnuck extends javax.swing.AbstractListModel[Nothing] {
         model =>
         val observer : PartialFunction[ Any, Unit ] = {
             case "Boopy" => fireIntervalAdded( model, 0, 1 )