[shotwell] Publishing: Fix warnings regarding set_default

[Jens Georg <jensgeorg src gnome org>]

commit cbc235060b5d9c5261a6281afa3f452dadeb705c
Author: Jens Georg <mail jensge org>
Date:   Wed Jan 23 14:53:34 2019 +0100

    Publishing: Fix warnings regarding set_default

 src/publishing/PublishingUI.vala | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/publishing/PublishingUI.vala b/src/publishing/PublishingUI.vala
index 911adc1d..995e50d3 100644
--- a/src/publishing/PublishingUI.vala
+++ b/src/publishing/PublishingUI.vala
@@ -393,11 +393,13 @@ public class PublishingDialog : Gtk.Dialog {
 
     public void set_close_button_mode() {
         close_cancel_button.set_label(_("_Close"));
+        close_cancel_button.set_can_default(true);
         set_default(close_cancel_button);
     }
 
     public void set_cancel_button_mode() {
         close_cancel_button.set_label(_("_Cancel"));
+        close_cancel_button.set_can_default(false);
     }
 
     public void lock_service() {