JS: move expressions test to box tests

js/js.translator/testData/box/expression/function/functionInsideFunction.kt

@@ -0,0 +1,21 @@
+package foo
+
+
+fun box(): String {
+    fun f() = 3
+
+    if ((f() + f()) != 6) return "fail1"
+    if (b() != 24) return "fail2"
+    return "OK"
+}
+
+
+fun b(): Int {
+
+    fun a(): Int {
+        fun c() = 4
+        return c() * 3
+    }
+    val a = 2
+    return a() * a
+}