JS: don't write native superclass to metadata. Fix KT-15007

js/js.translator/testData/box/rtti/subclassOfNativeIsInterface.kt

@@ -0,0 +1,25 @@
+@native open class A
+
+interface I
+
+class B : A(), I
+
+open class C : A()
+
+class D : C(), I
+
+fun box(): String {
+    var a: Any = A()
+    if (a is I) return "fail1"
+
+    a = B()
+    if (a !is I) return "fail2"
+
+    a = D()
+    if (a !is I) return "fail3"
+
+    a = C()
+    if (a is I) return "fail4"
+
+    return "OK"
+}