fix: "Browser not supported" error screen missing

[sandrade-dcl]

What does this PR fix?

Fixes https://github.com/decentraland/unity-renderer/pull/708

This error screen is not being showed when trying to run Decentraland with Safari.

The words "Chrome" and "Firefox" are links:

• Chrome: https://www.google.com/chrome/?brand=BNSD&gclid=Cj0KCQjw5uWGBhCTARIsAL70sLJsOBpT9ZDBOEtFx49Ya-nc0iCR50klEV8iLNoOdkeVtVly8x9_gXUaAhSdEALw_wcB&gclsrc=aw.ds
• Firefox: https://www.mozilla.org/en-US/firefox/new/

How to test it?

1. Open Safari browser.
2. Go to https://play.decentraland.zone/branch/fix/Browser-not-supported-error-screen-missing/index.html?ENV=org
3. Notice the error screen is showed.
4. Close Safari browser and open Chrome or Firefox.
5. Go to https://play.decentraland.zone/branch/fix/Browser-not-supported-error-screen-missing/index.html?ENV=org
6. Notice the world loads as usual.

[github-actions[bot]]

After the CI passes:

• This branch can be previewed at https://play.decentraland.zone/branch/fix/Browser-not-supported-error-screen-missing/index.html
• The decentraland-ecs package can be tested in scenes by running

  npm install "https://play.decentraland.zone/branch/fix/Browser-not-supported-error-screen-missing/decentraland-ecs.tgz"