Revert "Use .js import for exifr in Thumbnail Generator (#2195)"

This reverts commit 4b1297f71aaaff8e33ffb469836499c0b41b9f1d.

packages/@uppy/thumbnail-generator/src/index.js

@@ -4,7 +4,7 @@ const dataURItoBlob = require('@uppy/utils/lib/dataURItoBlob')
 const isObjectURL = require('@uppy/utils/lib/isObjectURL')
 const isPreviewSupported = require('@uppy/utils/lib/isPreviewSupported')
 const ORIENTATIONS = require('./image-orientations')
-const exifr = require('exifr/dist/mini.legacy.umd.js')
+const exifr = require('exifr/dist/mini.legacy.umd.cjs')
 
 /**
  * The Thumbnail Generator plugin