[krb5-auth-dialog] prefs: Use icon-name instead of deprecated stock

[Guido Günther <guidog src gnome org>]

commit 0f7f73637feacddd82dc3bb47128d8539be55443
Author: Guido Günther <agx sigxcpu org>
Date:   Thu Oct 13 11:40:51 2022 +0200

    prefs: Use icon-name instead of deprecated stock

 src/resources/ui/ka-preferences.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/src/resources/ui/ka-preferences.ui b/src/resources/ui/ka-preferences.ui
index f2f8770..98d4edb 100644
--- a/src/resources/ui/ka-preferences.ui
+++ b/src/resources/ui/ka-preferences.ui
@@ -109,7 +109,7 @@
                           <object class="GtkImage">
                             <property name="visible">True</property>
                             <property name="valign">start</property>
-                            <property name="stock">gtk-properties</property>
+                            <property name="icon-name">gtk-properties</property>
                             <property name="icon-size">6</property>
                           </object>
                         </child>