Fixed render error in Dataset files upload-section

src/ui/pages/dataset/dataset-stepper/steps/basic-info/upload-section/index.tsx

@@ -152,10 +152,10 @@ class UploadSection extends React.Component<IUploadSectionProps, any> {
                                         <div>
                                             { index + 1 }
                                         </div>
-                                        <div>{ (dataset.repositoryFiles[index] as RepositoryFile).originalFilename }</div>
+                                        <div>{ (fields.get(index) as RepositoryFile).originalFilename }</div>
                                         <ListItemSecondaryAction>
                                             <IconButton aria-label="Delete">
-                                                <DeleteIcon onClick={ this.deleteFile.bind(this, dataset.repositoryFiles[index].uuid) }/>
+                                                <DeleteIcon onClick={ this.deleteFile.bind(this, fields.get(index).uuid) }/>
                                             </IconButton>
                                         </ListItemSecondaryAction>
                                     </ListItem>