[buoh] Remove forgotten class

[Jan Tojnar <jtojnar src gnome org>]

commit 5016e34307971ea4e98c6c77637cb87d5c06faa5
Author: Jan Tojnar <jtojnar gmail com>
Date:   Mon Feb 4 20:03:07 2019 +0100

    Remove forgotten class

 src/buoh-add-comic-dialog.h | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/src/buoh-add-comic-dialog.h b/src/buoh-add-comic-dialog.h
index cc1117b..11cc471 100644
--- a/src/buoh-add-comic-dialog.h
+++ b/src/buoh-add-comic-dialog.h
@@ -27,10 +27,6 @@ G_BEGIN_DECLS
 #define BUOH_TYPE_ADD_COMIC_DIALOG buoh_add_comic_dialog_get_type ()
 G_DECLARE_FINAL_TYPE (BuohAddComicDialog, buoh_add_comic_dialog, BUOH, ADD_COMIC_DIALOG, GtkDialog)
 
-struct _BuohAddComicDialogClass {
-        GtkDialogClass   parent_class;
-};
-
 GtkWidget *buoh_add_comic_dialog_new       (void);
 
 G_END_DECLS