[UI] Set `max-width` for the media info modal.

This modal can grow very large depending on the size of the media
metadata, thus it's wise to keep its width in check.

platypush/backend/http/webapp/src/components/panels/Media/Index.vue

@@ -458,4 +458,10 @@ export default {
     padding: 0;
   }
 }
+
+:deep(.media-info-container) {
+  .modal {
+    max-width: 70em;
+  }
+}
 </style>