Remove isRecording from constructor

It's an internal tracker that should not be modified while
instantiating.

Author: rlazo

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/LiveGenerativeModel.kt

@@ -102,8 +102,7 @@ internal constructor(
     return if (receivedJson.contains("setupComplete")) {
       LiveSession(
         session = webSession,
-        backgroundDispatcher = backgroundDispatcher,
-        isRecording = false
+        backgroundDispatcher = backgroundDispatcher
       )
     } else {
       webSession.close()

firebase-vertexai/src/main/kotlin/com/google/firebase/vertexai/type/LiveSession.kt

@@ -44,14 +44,14 @@ public class LiveSession
 internal constructor(
   private val session: ClientWebSocketSession?,
   @Background private val backgroundDispatcher: CoroutineContext,
-  private var isRecording: Boolean,
   private var audioHelper: AudioHelper? = null
 ) {
 
   private val audioQueue = ConcurrentLinkedQueue<ByteArray>()
   private val playBackQueue = ConcurrentLinkedQueue<ByteArray>()
   private var startedReceiving = false
   private var receiveChannel: Channel<Frame> = Channel()
+  private var isRecording: Boolean = false
 
   private companion object {
     val TAG = LiveSession::class.java.simpleName