[five-or-more] Fix GtkStyleContext warnings with GTK+ 3.20

[Michael Catanzaro <mcatanzaro src gnome org>]

commit 14fd3507e79e0896810bb414c997f63cf5126cb8
Author: Michael Catanzaro <mcatanzaro gnome org>
Date:   Sat Jul 30 22:55:20 2016 -0500

    Fix GtkStyleContext warnings with GTK+ 3.20

 src/five-or-more.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/five-or-more.c b/src/five-or-more.c
index 9689ba8..7d8d6b7 100644
--- a/src/five-or-more.c
+++ b/src/five-or-more.c
@@ -287,7 +287,7 @@ refresh_preview_surfaces (void)
   cairo_surface_t *preview_surface = NULL;
 
   context = gtk_widget_get_style_context (widget);
-  gtk_style_context_get_background_color (context, GTK_STATE_FLAG_NORMAL, &bg);
+  gtk_style_context_get_background_color (context, gtk_style_context_get_state (context), &bg);
 
   /* Like the refresh_pixmaps() function, we may be called before
    * the window is ready. */