remove unused member variables

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/main/java/com/nextcloud/talk/adapters/messages/IncomingVoiceMessageViewHolder.kt

@@ -25,7 +25,6 @@
 package com.nextcloud.talk.adapters.messages
 
 import android.annotation.SuppressLint
-import android.app.Activity
 import android.content.Context
 import android.graphics.drawable.Drawable
 import android.graphics.drawable.LayerDrawable
@@ -71,8 +70,6 @@ class IncomingVoiceMessageViewHolder(incomingView: View) : MessageHolders
 
     lateinit var message: ChatMessage
 
-    lateinit var activity: Activity
-
     lateinit var voiceMessageInterface: VoiceMessageInterface
 
     @SuppressLint("SetTextI18n")

app/src/main/java/com/nextcloud/talk/adapters/messages/OutcomingVoiceMessageViewHolder.kt

@@ -23,10 +23,8 @@
 package com.nextcloud.talk.adapters.messages
 
 import android.annotation.SuppressLint
-import android.app.Activity
 import android.content.Context
 import android.graphics.PorterDuff
-import android.media.MediaPlayer
 import android.os.Handler
 import android.util.Log
 import android.view.View
@@ -68,10 +66,6 @@ class OutcomingVoiceMessageViewHolder(outcomingView: View) : MessageHolders
 
     lateinit var message: ChatMessage
 
-    lateinit var activity: Activity
-
-    var mediaPlayer: MediaPlayer? = null
-
     lateinit var handler: Handler
 
     lateinit var voiceMessageInterface: VoiceMessageInterface