JS: move expressions test to box tests

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

@@ -0,0 +1,12 @@
+package foo
+
+fun test(f: (Int) -> Boolean, p: Int) = f(p)
+
+fun box(): String {
+    if (!test({ it + 1 == 2 }, 1)) return "fail1"
+
+    if (!test({ it > 1 }, 3)) return "fail2"
+
+    return if (test({ ((it < 1) == false) }, 1)) "OK" else "fail3"
+
+}