JS backend: added more tests for closures.

js/js.translator/testData/closure/cases/closureReceiverInLocalExtFunByLocalExtFun.kt

@@ -0,0 +1,15 @@
+package foo
+
+fun box(): String {
+
+  fun Int.foo(): Boolean {
+      fun Int.bar() = this == 2 && this@foo == 1
+      val b = { this == 1 }
+
+      return this == 1 && 2.bar() && b()
+  }
+
+  if (!1.foo()) return "Failed"
+
+  return "OK"
+}