[mirotalksfu] - add missing og:url

app/src/config.template.js

@@ -240,6 +240,7 @@ module.exports = {
                 title: 'Click the link to make a call.',
                 description: 'MiroTalk SFU calling provides real-time video calls, messaging and screen sharing.',
                 image: 'https://sfu.mirotalk.com/images/mirotalksfu.png',
+                url: 'https://sfu.mirotalk.com',
             },
             html: {
                 features: true,