fix: blocking alerts accidentally got enabled for everyone (#2731)

## Description

In the last PR I forgot to uncomment the check

## Steps for reproduction

1. click button
2. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env.example`
and the `builder/env-check.js` if mandatory

apps/builder/app/builder/features/blocking-alerts/blocking-alerts.tsx

@@ -25,7 +25,7 @@ const useUnsupportedBrowser = () => {
   const [message, setMessage] = useState<ReactNode>();
   useEffect(() => {
     if ("chrome" in window || isFeatureEnabled("unsupportedBrowsers")) {
-      //return;
+      return;
     }
 
     setMessage(