Report validation errors with correct error code (#2299)

spec/ParseAPI.spec.js

@@ -1017,7 +1017,7 @@ describe('miscellaneous', function() {
       fail('Validation should not have succeeded');
       done();
     }, (e) => {
-      expect(e.code).toEqual(141);
+      expect(e.code).toEqual(142);
       expect(e.message).toEqual('Validation failed.');
       done();
     });

src/Routers/FunctionsRouter.js

@@ -73,7 +73,7 @@ export class FunctionsRouter extends PromiseRouter {
       if (theValidator && typeof theValidator === "function") {
         var result = theValidator(request);
         if (!result) {
-          throw new Parse.Error(Parse.Error.SCRIPT_FAILED, 'Validation failed.');
+          throw new Parse.Error(Parse.Error.VALIDATION_ERROR, 'Validation failed.');
         }
       }