[gnome-builder] workspace: fix vertical alignment of button images

[Christian Hergert <chergert src gnome org>]

commit a3cb45b3a352d48bc38736a0a7bb378e0453105e
Author: Christian Hergert <christian hergert me>
Date:   Mon Oct 20 15:32:39 2014 -0700

    workspace: fix vertical alignment of button images

 src/resources/ui/gb-workbench.ui |    6 ++++++
 1 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/src/resources/ui/gb-workbench.ui b/src/resources/ui/gb-workbench.ui
index f2d008c..d26c147 100644
--- a/src/resources/ui/gb-workbench.ui
+++ b/src/resources/ui/gb-workbench.ui
@@ -71,6 +71,9 @@
         <child>
           <object class="GtkMenuButton" id="gear_menu_button">
             <property name="visible">True</property>
+            <style>
+              <class name="image-button"/>
+            </style>
             <child>
               <object class="GtkImage" id="menu_image">
                 <property name="visible">True</property>
@@ -86,6 +89,9 @@
         <child>
           <object class="GtkMenuButton" id="add_button">
             <property name="visible">True</property>
+            <style>
+              <class name="image-button"/>
+            </style>
             <child>
               <object class="GtkImage" id="add_image">
                 <property name="visible">True</property>