Hide theme preview as it's broken with GTK+ 3
https://git.archlinux.org/svntogit/community.git/tree/trunk/PKGBUILD?h=packages/lxappearance-obconf-gtk3
https://sourceforge.net/p/lxde/bugs/768/

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
--- lxappearance-obconf-0.2.3/src/obconf.glade.orig	2016-06-19 12:09:46.005536697 +0200
+++ lxappearance-obconf-0.2.3/src/obconf.glade	2016-06-19 12:09:51.977462436 +0200
@@ -539,26 +539,6 @@
           </packing>
         </child>
         <child>
-          <object class="GtkFrame" id="frame1">
-            <property name="visible">True</property>
-            <property name="can_focus">False</property>
-            <property name="label_xalign">0</property>
-            <child>
-              <object class="GtkImage" id="preview">
-                <property name="visible">True</property>
-                <property name="can_focus">False</property>
-                <property name="stock">gtk-missing-image</property>
-              </object>
-            </child>
-            <child type="label_item">
-              <placeholder/>
-            </child>
-          </object>
-          <packing>
-            <property name="expand">True</property>
-            <property name="fill">True</property>
-            <property name="position">1</property>
-          </packing>
         </child>
       </object>
       <packing>