fix: set proper mute state for audio/video tracks after reconnection (#963)

Closes #962

### How does it fix that?

The methods `publishAudioTrack` and `publishVideoTrack` are called on
call reconnection here -

https://github.com/livekit/client-sdk-flutter/blob/70d4d1f5fdc6f565cbe565e3d5a50d5c23b5ddef/lib/src/participant/local.dart#L560-L570

But inside the methods we're not passing the `muted` state from the old
tracks we have. It defaults to `false` because it's not set in protobuf:

https://github.com/livekit/client-sdk-flutter/blob/70d4d1f5fdc6f565cbe565e3d5a50d5c23b5ddef/lib/src/proto/livekit_rtc.pb.dart#L1153

By passing it correctly, this PR fixes the bug in the linked issue.

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## Summary by CodeRabbit

* **Bug Fixes**
* Fixed an issue where the muted state of audio and video tracks was not
being correctly propagated when publishing to the server.

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settings.</sub>

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Author: coder-with-a-bushido

lib/src/participant/local.dart

@@ -134,6 +134,7 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
       name: publishOptions.name ?? AudioPublishOptions.defaultMicrophoneName,
       type: track.kind.toPBType(),
       source: track.source.toPBType(),
+      muted: track.muted,
       stream: buildStreamId(publishOptions, track.source),
       disableDtx: !publishOptions.dtx,
       disableRed: room.e2eeManager != null ? true : publishOptions.red ?? true,
@@ -361,7 +362,7 @@ class LocalParticipant extends Participant<LocalTrackPublication> {
       source: track.source.toPBType(),
       encryption: room.roomOptions.lkEncryptionType,
       simulcastCodecs: simulcastCodecs,
-      muted: false,
+      muted: track.muted,
       stream: buildStreamId(publishOptions, track.source),
     );