Call the correct function on error

In 7b29541 we introduced the 'pull latest image' option which changed
the onDownloadContainerFinished function but the pullImage's catch
wasn't updated. Causing the download to stay forever when it fails and
no error message being shown.

Closes cockpit-project#914

src/ImageRunModal.jsx

@@ -511,7 +511,7 @@ export class ImageRunModal extends React.Component {
                         });
             })
                     .catch(ex => {
-                        this.props.onDownloadContainerFinished(createConfig);
+                        onDownloadContainerFinished(createConfig);
                         const error = cockpit.format(_("Failed to pull image $0"), tempImage.image);
                         this.props.onAddNotification({ type: 'danger', error, errorDetail: ex.reason });
                     });