[shotwell] Remove get_background_color() call

[Jens Georg <jensgeorg src gnome org>]

commit c8b3e2fb135f42505e2be0bbd07f7c405c2728e1
Author: Jens Georg <mail+gitkraken jensge org>
Date:   Sat Mar 31 13:39:18 2018 +0200

    Remove get_background_color() call

 src/CheckerboardLayout.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/CheckerboardLayout.vala b/src/CheckerboardLayout.vala
index be7756f..f39a4f7 100644
--- a/src/CheckerboardLayout.vala
+++ b/src/CheckerboardLayout.vala
@@ -1906,7 +1906,7 @@ public class CheckerboardLayout : Gtk.DrawingArea {
         selected_color = Config.Facade.get_instance().get_selected_color(in_focus);
         unselected_color =  Config.Facade.get_instance().get_unselected_color();
         border_color =  Config.Facade.get_instance().get_border_color();
-        bg_color = get_style_context().get_background_color(Gtk.StateFlags.NORMAL);
+        bg_color = Config.Facade.get_instance().get_bg_color();
     }
     
     public override void size_allocate(Gtk.Allocation allocation) {