Also fix safari for embed

client/src/standalone/videos/embed.html

@@ -6,6 +6,18 @@
     <meta name="robots" content="noindex">
     <meta property="og:platform" content="PeerTube" />
 
+    <script type="text/javascript">
+    // Thanks: https://mathiasbynens.be/notes/globalthis
+    (function() {
+      if (typeof globalThis === 'object') return;
+      Object.prototype.__defineGetter__('__magic__', function() {
+        return this;
+      });
+      __magic__.globalThis = __magic__
+      delete Object.prototype.__magic__;
+    }());
+    </script>
+
 
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