feat(VoiceState): self mute/deaf methods (#3243)

* Implemented setSelfMute/Deaf, done typings, fixed bug in VoiceState with errors.

* Completed requested changes

* return send in sendVoiceStateUpdate so its a promise, update typings

* Updated methods to return a boolean

* Requested changes

* Fix bug

* Update src/structures/VoiceState.js

Co-Authored-By: MrJacz <23615291+MrJacz@users.noreply.github.com>

* fix

src/client/voice/VoiceConnection.js

@@ -177,20 +177,21 @@ class VoiceConnection extends EventEmitter {
   /**
    * Sends a request to the main gateway to join a voice channel.
    * @param {Object} [options] The options to provide
+   * @returns {Promise<Shard>}
    * @private
    */
   sendVoiceStateUpdate(options = {}) {
     options = Util.mergeDefault({
       guild_id: this.channel.guild.id,
       channel_id: this.channel.id,
-      self_mute: false,
-      self_deaf: false,
+      self_mute: this.voice ? this.voice.selfMute : false,
+      self_deaf: this.voice ? this.voice.selfDeaf : false,
     }, options);
 
     const queueLength = this.channel.guild.shard.ratelimit.queue.length;
     this.emit('debug', `Sending voice state update (queue length is ${queueLength}): ${JSON.stringify(options)}`);
 
-    this.channel.guild.shard.send({
+    return this.channel.guild.shard.send({
       op: OPCodes.VOICE_STATE_UPDATE,
       d: options,
     });