Minor in JS backend tests: use checkFooBoxIsOk instead of fooBoxIsValue

js/js.translator/testData/expression/dollarParameter/cases/dollarParameter.kt

@@ -5,5 +5,6 @@ fun MyController(`$scope`: String): String {
 }
 
 fun box(): String {
-    return MyController("world")
-}
+    assertEquals("Hello world!", MyController("world"))
+    return "OK"
+}