[goobox] removed unused function

[Paolo Bacchilega <paobac src gnome org>]

commit 348c744662ec88e1cba664f162c0220fe18e5773
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Dec 30 22:13:41 2018 +0100

    removed unused function

 src/main.h | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/main.h b/src/main.h
index 0a7c219..e16b1a1 100644
--- a/src/main.h
+++ b/src/main.h
@@ -33,7 +33,6 @@ extern int           arg_toggle_visibility;
 GtkWidget *    main_get_window_from_device     (const char     *device);
 BraseroDrive * main_get_most_likely_drive      (void);
 BraseroDrive * main_get_drive_for_device       (const char     *device);
-gboolean       notification_has_persistence    (void);
 void           system_notify                   (GooWindow      *window,
                                                const char      *id,
                                                const char      *title,