[Glitch] Fix fullscreen video player

Port 53b1d88873 to glitch-soc

app/javascript/flavours/glitch/styles/components/media.scss

@@ -302,6 +302,8 @@
     video {
       max-width: 100% !important;
       max-height: 100% !important;
+      width: 100% !important;
+      height: 100% !important;
     }
   }