minor #386 [UxSite] Fixing missing slash on image path (weaverryan)

This PR was merged into the 2.x branch.

Discussion
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[UxSite] Fixing missing slash on image path

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| Tickets       | Fix #381
| License       | MIT

It's a bit odd that it worked at all, but this fixes the problem. The code is still a pretty "cheap" way (i.e. hardcoded) to get the path, but it should work fine for now.

Cheers!

Commits
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c9ffa8b [UxSite] Fixing missing slash on image path

Author: weaverryan

ux.symfony.com/src/Model/LiveDemo.php

@@ -34,6 +34,6 @@ public function getRoute(): string
 
     public function getScreenshotFilename(): string
     {
-        return 'build/images/live_demo/'.$this->identifier.'.png';
+        return '/build/images/live_demo/'.$this->identifier.'.png';
     }
 }