[gnome-builder] symbol-tree: show icons for symbol tree

[Christian Hergert <chergert src gnome org>]

commit 8e93d930ea68246ef2b2e07bb5ff9bbcaf17aa77
Author: Christian Hergert <chergert redhat com>
Date:   Sat Jul 1 15:22:47 2017 -0700

    symbol-tree: show icons for symbol tree
    
    I forgot to set this when porting the symbol tree to the menu
    button popover.

 plugins/symbol-tree/gbp-symbol-menu-button.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/plugins/symbol-tree/gbp-symbol-menu-button.ui b/plugins/symbol-tree/gbp-symbol-menu-button.ui
index 2d71fda..39c35f9 100644
--- a/plugins/symbol-tree/gbp-symbol-menu-button.ui
+++ b/plugins/symbol-tree/gbp-symbol-menu-button.ui
@@ -13,6 +13,7 @@
         <child>
           <object class="DzlTree" id="tree">
             <property name="headers-visible">false</property>
+            <property name="show-icons">true</property>
             <property name="activate-on-single-click">true</property>
             <property name="visible">true</property>
             <child type="builder">