JS backend: fix tests after move testTrue and testFalse to common place

js/js.translator/testData/expression/string/cases/stringInTemplate.kt

@@ -1,7 +1,10 @@
+// CHECK_NOT_CALLED_IN_SCOPE: scope=box function=toString
+
 package foo
 
 fun box(): String {
     var name = "Hello"
-    return ("o${name}o");
+    assertEquals("oHelloo", "o${name}o")
+    return "OK";
 }