change mouse click behaviour of sound widget

config.py

@@ -162,7 +162,10 @@ screens = [
                     background=nord["polar_night_1"],
                     foreground=nord["frost_1"],
                     fmt=" {}",
-                    mouse_callbacks={"Button1": lambda: qtile.spawn("pavucontrol")},
+                    mouse_callbacks={
+                        "Button1": lambda: qtile.spawn("pavucontrol"),
+                        "Button3": lambda: qtile.spawn("pactl set-sink-mute @DEFAULT_SINK@ toggle"),
+                    },
                     **powerline
                 ),
 
@@ -177,7 +180,6 @@ screens = [
                     empty_char="",
                     update_interval=10,
                     show_short_text=False,
-                    #mouse_callbacks={"Button1": lambda: qtile.spawn("xfce4-power-manager-settings")},
                     **powerline
                 ),