JS: move expressions test to box tests

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

@@ -0,0 +1,9 @@
+package foo
+
+fun sum(param1: Int, param2: Int): Int {
+    return param1 + param2;
+}
+
+fun box(): String {
+    return if (sum(1, 5) == 6) "OK" else "fail"
+}