Add run test for #24507

Author: tanishiking

tests/pos/i24507/A.java

@@ -0,0 +1 @@
+foo

tests/pos/i24507/Test.scala

@@ -0,0 +1,9 @@
+package a;
+
+public class A {
+  protected class B {
+    public String foo() {
+      return "foo";
+    }
+  }
+}

tests/run/i24507.check

@@ -0,0 +1,12 @@
+// scalajs: --skip
+import a._
+
+class T extends A {
+  class Acc extends B
+  val acc = new Acc
+  def foo(): String = acc.foo()
+}
+
+@main def Test =
+  val t = new T
+  println(t.foo())