[krb5-auth-dialog] prefs: Use an existing icon

[Guido Günther <guidog src gnome org>]

commit 84f5bdb366cf9b6fa624a63b73d5051adcfce94c
Author: Guido Günther <agx sigxcpu org>
Date:   Tue Oct 18 11:21:16 2022 +0200

    prefs: Use an existing icon

 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 9ebf461..9aeb6ad 100644
--- a/src/resources/ui/ka-preferences.ui
+++ b/src/resources/ui/ka-preferences.ui
@@ -107,7 +107,7 @@
                           <object class="GtkImage">
                             <property name="visible">True</property>
                             <property name="valign">start</property>
-                            <property name="icon-name">gtk-properties</property>
+                            <property name="icon-name">preferences-system</property>
                             <property name="pixel-size">48</property>
                           </object>
                         </child>