@uppy/robodog: fix CDN bundle (#3587)

Fixes: https://github.com/transloadit/uppy/issues/3582

packages/@uppy/robodog/bundle.js

@@ -1 +1,2 @@
-module.exports = require('./bundle-legacy.js')
+// eslint-disable-next-line no-multi-assign
+globalThis.Robodog = module.exports = require('./bundle-legacy.js')