[gnome-klotski] Fix window size increase under GTK+ 3.18

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a75cf8fd25a772c5013b3a0da64c099e1aec80e2
Author: Michael Catanzaro <mcatanzaro igalia com>
Date:   Sun Feb 14 10:43:43 2016 -0600

    Fix window size increase under GTK+ 3.18

 src/klotski-window.vala |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)
---
diff --git a/src/klotski-window.vala b/src/klotski-window.vala
index b99e44e..05d93e1 100644
--- a/src/klotski-window.vala
+++ b/src/klotski-window.vala
@@ -538,8 +538,7 @@ public class KlotskiWindow : ApplicationWindow
     {
         if (window_is_maximized || is_tiled)
             return;
-        window_width = allocation.width;
-        window_height = allocation.height;
+        get_size (out window_width, out window_height);
     }
 
     [GtkCallback]