@uppy/dashboard: do not allow drag&drop of file preview (#5650)

Author: Murderlon

packages/@uppy/dashboard/src/components/FilePreview.tsx

@@ -9,6 +9,7 @@ export default function FilePreview(props: $TSFixMe) {
   if (file.preview) {
     return (
       <img
+        draggable={false}
         className="uppy-Dashboard-Item-previewImg"
         alt={file.name}
         src={file.preview}