[gnome-calculator] math-window: vertically center headerbar menu button label

[Robert Roth <robertroth src gnome org>]

commit b5085963fbbbb3a30a379af0b663864b7f703e16
Author: Lapo Calamandrei <calamandrei gmail com>
Date:   Thu Sep 22 14:23:38 2016 +0200

    math-window: vertically center headerbar menu button label
    
    https://bugzilla.gnome.org/show_bug.cgi?id=771829

 data/math-window.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/math-window.ui b/data/math-window.ui
index c50768a..f74d507 100644
--- a/data/math-window.ui
+++ b/data/math-window.ui
@@ -109,6 +109,7 @@
               <object class="GtkGrid" id="grid1">
                 <property name="visible">True</property>
                 <property name="can_focus">False</property>
+                <property name="valign">center</property>
                 <child>
                   <object class="GtkLabel" id="mode_label">
                     <property name="visible">True</property>