JS: move expressions test to box tests

js/js.translator/testData/box/expression/misc/extensionLiteralCreatedAtPackageLevel.kt

@@ -0,0 +1,22 @@
+package foo
+
+class A() {
+    fun foo() = 1
+    fun a(f: A.() -> Int): Int {
+        return f()
+    }
+}
+
+var d = 0
+
+val p: A.() -> Int = {
+    d = foo()
+    d++
+}
+
+val c = A().a(p)
+
+fun box(): String {
+    if (c != 1) return "fail: $c"
+    return "OK"
+}