[gnome-control-center/use-user-avatar-symbolic-in-sound-test] sound: Use "avatar-default-symbolic" in sound test dialog

[Felipe Borges <felipeborges src gnome org>]

commit be9d71ed6a3a18a6b92260a6ebdb06593ce764ab
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue Sep 17 10:30:47 2019 +0200

    sound: Use "avatar-default-symbolic" in sound test dialog
    
    The colour icon blends with bright themes (such as Adwaita) making
    it hard to distinguish.
    
    The symbolic variant of the same asset contrasts fine with light
    and dark background and matches the "symbolic" pattern of the other
    two buttons shown in the dialog (the audio-volume-* icons).
    
    Fixes #502

 panels/sound/cc-output-test-dialog.ui | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/panels/sound/cc-output-test-dialog.ui b/panels/sound/cc-output-test-dialog.ui
index d5e16132d..8d84e275e 100644
--- a/panels/sound/cc-output-test-dialog.ui
+++ b/panels/sound/cc-output-test-dialog.ui
@@ -68,7 +68,7 @@
             <child>
               <object class="GtkImage">
                 <property name="visible">True</property>
-                <property name="icon_name">avatar-default</property>
+                <property name="icon_name">avatar-default-symbolic</property>
                 <property name="pixel_size">64</property>
               </object>
               <packing>