AKA don't do that.
Is the site title broken when you visit the website in your browser?
If it's not broken, just wait until Google visits your site again or ask for a new page indexing.
If it's broken, try clearing the Flarum cache. If that doesn't help, follow the troubleshooting guide in our documentation.
Don't modify any file inside the vendor folder, it will only make things worse and harder to troubleshoot.