[gnome-screenshot] dialog: Fix dnd preview size

[Alexander Mikhaylenko <alexm src gnome org>]

commit d3ca96b22beabf59997f0e8c769bc31d720a63ef
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Tue Mar 10 18:34:57 2020 +0500

    dialog: Fix dnd preview size
    
    Fix a regression from !7.

 src/screenshot-dialog.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/screenshot-dialog.c b/src/screenshot-dialog.c
index d674584..44797a8 100644
--- a/src/screenshot-dialog.c
+++ b/src/screenshot-dialog.c
@@ -133,7 +133,7 @@ drag_begin (GtkWidget        *widget,
             GdkDragContext   *context,
             ScreenshotDialog *dialog)
 {
-  gtk_drag_set_icon_pixbuf (context, dialog->screenshot,
+  gtk_drag_set_icon_pixbuf (context, dialog->preview_image,
                             dialog->drag_x, dialog->drag_y);
 }