JS backend: fixed the variable capturing in deeply nested functions.

(cherry picked from commit cee29a6)

js/js.translator/testFiles/closure/cases/localParameterInLocalNamedFunction.kt

@@ -0,0 +1,27 @@
+package foo
+
+fun getLastFocused(callback:(window:Any?)->Unit) {
+    callback(null)
+}
+
+fun box(): Boolean {
+    var result = "no"
+    createTab(true) {
+        result = it
+    }
+    return result == "yes"
+}
+
+fun createTab(focusWindow:Boolean, callback:((String)->Unit)?) {
+    getLastFocused {
+        fun createTab() {
+            if (focusWindow && callback != null) {
+                callback("yes")
+            }
+        }
+
+        if (it == null) {
+            createTab()
+        }
+    }
+}