JS: create new common directory for all generated tests, migrate several tests there

js/js.translator/testData/box/defaultArguments/defArgsWithSuperCall.kt

@@ -0,0 +1,12 @@
+package foo
+
+open class A(val a: Int = 1, val b: Int = 2)
+
+class B : A(b = 3)
+
+fun box(): String {
+    val b = B()
+    if (b.a != 1) return "b.a != 1, it: ${b.a}"
+    if (b.b != 3) return "b.a != 3, it: ${b.b}"
+    return "OK"
+}