examples: fix s3 import path

examples/dev/Dashboard.js

@@ -9,7 +9,7 @@ const Url = require('@uppy/url/src')
 const Webcam = require('@uppy/webcam/src')
 const GoldenRetriever = require('@uppy/golden-retriever/src')
 const Tus = require('@uppy/tus/src')
-const AwsS3 = require('@uppy/tus/src')
+const AwsS3 = require('@uppy/aws-s3/src')
 const XHRUpload = require('@uppy/xhr-upload/src')
 const Transloadit = require('@uppy/transloadit/src')
 const Form = require('@uppy/form/src')