Update ModalDropzone.jsx

Author: MuPp3t33r

src/generic/modal-dropzone/ModalDropzone.jsx

@@ -129,7 +129,7 @@ ModalDropzone.defaultProps = {
   imageHelpText: '',
   previewComponent: null,
   imageDropzoneText: '',
-  maxSize: undefind,
+  maxSize: '',
   invalidFileSizeMore: '',
   onSelectFile: null,
 };