[shotwell] Add missing shortcut for Set Background

[Jens Georg <jensgeorg src gnome org>]

commit a6e8b19ed137682917cb2d7e600476f8ff265a5f
Author: Jens Georg <mail jensge org>
Date:   Sun Dec 4 20:12:30 2016 +0100

    Add missing shortcut for Set Background
    
    Signed-off-by: Jens Georg <mail jensge org>

 src/PhotoPage.vala              |    2 +-
 src/direct/DirectPhotoPage.vala |    2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/src/PhotoPage.vala b/src/PhotoPage.vala
index 259459e..ba0ba43 100644
--- a/src/PhotoPage.vala
+++ b/src/PhotoPage.vala
@@ -2458,7 +2458,7 @@ public class LibraryPhotoPage : EditingHostPage {
         groups += publish_group;
         
         InjectionGroup bg_group = new InjectionGroup("SetBackgroundPlaceholder");
-        bg_group.add_menu_item(_("Set as _Desktop Background"), "SetBackground");
+        bg_group.add_menu_item(_("Set as _Desktop Background"), "SetBackground", "<Primary>b");
         
         groups += bg_group;
         
diff --git a/src/direct/DirectPhotoPage.vala b/src/direct/DirectPhotoPage.vala
index 57dfe11..9688aa5 100644
--- a/src/direct/DirectPhotoPage.vala
+++ b/src/direct/DirectPhotoPage.vala
@@ -80,7 +80,7 @@ public class DirectPhotoPage : EditingHostPage {
         groups += print_group;
         
         InjectionGroup bg_group = new InjectionGroup("SetBackgroundPlaceholder");
-        bg_group.add_menu_item(_("Set as _Desktop Background"), "SetBackground");
+        bg_group.add_menu_item(_("Set as _Desktop Background"), "SetBackground", "<Primary>b");
         
         groups += bg_group;