[KPhotoAlbum] Labels are not repainted on ThumbnailView

[Christoph Moseler]

Hi Jesper,

after leaving the annotation dialog, the labels under the thumbs are not 
repainted if they were changed in the anno dialog. That only happens for 
labels on the ThumbnailView that were not disguised by the annotation 
dialog before.

This patch might fix it.

void MainWindow::Window::slotChanges()
{
     setDirty( true );
+    reloadThumbnails(true);
}

Cheers,
Christoph