[gnome-control-center] sound: Apply device changes

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit f0812644aeaa56d26468dc11e9af7dffc31c0f16
Author: Robert Ancell <robert ancell canonical com>
Date:   Thu Mar 14 10:58:59 2019 +1300

    sound: Apply device changes
    
    Was missing the code to actually apply the changes.

 panels/sound/cc-sound-panel.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/panels/sound/cc-sound-panel.c b/panels/sound/cc-sound-panel.c
index 0c28980f6..3ebc20771 100644
--- a/panels/sound/cc-sound-panel.c
+++ b/panels/sound/cc-sound-panel.c
@@ -122,6 +122,8 @@ output_device_changed_cb (CcSoundPanel *self)
 
   gtk_widget_set_visible (GTK_WIDGET (self->fade_row), can_fade);
   gtk_widget_set_visible (GTK_WIDGET (self->subwoofer_row), has_lfe);
+
+  gvc_mixer_control_change_output (self->mixer_control, device);
 }
 
 static void
@@ -140,6 +142,8 @@ input_device_changed_cb (CcSoundPanel *self)
 
   cc_volume_slider_set_stream (self->input_volume_slider, stream);
   cc_level_bar_set_stream (self->input_level_bar, stream, CC_LEVEL_BAR_STREAM_TYPE_INPUT);
+
+  gvc_mixer_control_change_input (self->mixer_control, device);
 }
 
 static void