Don't exit prematurely

There was an accidental exit in the middle of shortcut setup
that caused us to not load custom shortcuts.

https://bugzilla.gnome.org/show_bug.cgi?id=643098

panels/keyboard/keyboard-shortcuts.c

@@ -686,8 +686,8 @@ reload_sections (GtkBuilder *builder)
       if (!dir)
         {
           g_free (dir_path);
-	  return;
-	}
+          continue;
+        }
 
       for (name = g_dir_read_name (dir) ; name ; name = g_dir_read_name (dir))
         {