[gtk+] icon browser: Remove usage of stock-size property

[Timm Bäder <baedert src gnome org>]

commit e8986d18c2deb5dd6b1a674d30502c0aa4bdd95e
Author: Timm Bäder <mail baedert org>
Date:   Tue Jan 30 21:38:23 2018 +0100

    icon browser: Remove usage of stock-size property
    
    Does not exist anymore.

 demos/icon-browser/window.ui |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/demos/icon-browser/window.ui b/demos/icon-browser/window.ui
index 330532e..8692295 100644
--- a/demos/icon-browser/window.ui
+++ b/demos/icon-browser/window.ui
@@ -91,7 +91,6 @@
                       <object class="GtkCellRendererPixbuf" id="cell">
                         <property name="xpad">10</property>
                         <property name="ypad">10</property>
-                        <property name="stock-size">6</property>
                       </object>
                     </child>
                     <child>