fix(keybinding): fix mute state conflict when volume is reduced to 0

When the volume is reduced to 0, changeSinkVolume first calls
SetMute(false) to unmute, then SetVolume(0) internally calls
SetMute(true) to mute again, resulting in a redundant DBus call
and potential UI flicker of the mute state.

当音量减小到0时，changeSinkVolume中先调用SetMute(false)取消静音，
随后SetVolume(0)内部又调用SetMute(true)重新设置静音，导致一次
多余的DBus调用，并可能引起UI静音状态短暂闪烁。

Log: fix mute state conflict when volume is reduced to 0
Pms: BUG-350763

Author: yixinshark

keybinding1/audio_controller.go

@@ -216,17 +216,6 @@ func (c *AudioController) changeSinkVolume(raised bool) error {
 		}
 
 		logger.Debug("[changeSinkVolume] will set volume to:", v)
-		mute, err := sink.Mute().Get(0)
-		if err != nil {
-			return err
-		}
-
-		if mute {
-			err = sink.SetMute(0, false)
-			if err != nil {
-				logger.Warning(err)
-			}
-		}
 
 		err = sink.SetVolume(0, v, true)
 		if err != nil {