[K/JS] Fix private constructor delegating inside single class with ES6 mode ^KT-59335 Fixed

js/js.translator/testData/box/inheritance/delegatingToSecondaryCtor.kt

@@ -0,0 +1,16 @@
+// EXPECTED_REACHABLE_NODES: 1344
+open class MyClass1 private constructor(val value: String) {
+    constructor(i: Int): this(i.toString())
+}
+
+class MyClass2 : MyClass1 {
+    constructor(i: Int): super(i)
+}
+
+fun test(x: Any) = x is MyClass2
+
+fun box(): String {
+    val b = test(MyClass2(0))
+
+    return if (b) "OK" else "NOT OK"
+}