Update tutorial with new changes from the SDK

Author: zsmb13

samplejava/src/main/java/com/example/chattutorialjava/ChannelActivity.java

@@ -73,7 +73,6 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         // Step 4 - Let the message input know when we are editing a message
         binding.messageListView.setOnMessageEditHandler(message -> {
             messageInputViewModel.getEditMessage().postValue(message);
-            return Unit.INSTANCE;
         });
 
         // Step 5 - Handle navigate up state

samplejava/src/main/java/com/example/chattutorialjava/ChannelActivity2.java

@@ -82,7 +82,6 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         // Step 5 - Let the message input know when we are editing a message
         binding.messageListView.setOnMessageEditHandler(message -> {
             messageInputViewModel.getEditMessage().postValue(message);
-            return Unit.INSTANCE;
         });
 
         // Step 6 - Handle back button behaviour correctly when you're in a thread

samplejava/src/main/java/com/example/chattutorialjava/ChannelActivity3.java

@@ -90,7 +90,6 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         // Step 5 - Let the message input know when we are editing a message
         binding.messageListView.setOnMessageEditHandler(message -> {
             messageInputViewModel.getEditMessage().postValue(message);
-            return Unit.INSTANCE;
         });
 
         // Step 6 - Handle back button behaviour correctly when you're in a thread

samplejava/src/main/java/com/example/chattutorialjava/ChannelActivity4.java

@@ -91,7 +91,6 @@ protected void onCreate(@Nullable Bundle savedInstanceState) {
         // Step 5 - Let the message input know when we are editing a message
         binding.messageListView.setOnMessageEditHandler(message -> {
             messageInputViewModel.getEditMessage().postValue(message);
-            return Unit.INSTANCE;
         });
 
         // Step 6 - Handle back button behaviour correctly when you're in a thread

samplejava/src/main/java/com/example/chattutorialjava/ImgurAttachmentViewHolder.java

@@ -54,7 +54,6 @@ private ImgurAttachmentViewHolder(@NotNull ViewHolderImgurAttachmentBinding bind
     @Override
     public void bindData(
             @NotNull MessageListItem.MessageItem data,
-            boolean isThread,
             @Nullable MessageListItemPayloadDiff diff
     ) {
         List<Attachment> attachments = data.getMessage().getAttachments();

samplekotlin/src/main/java/com/example/chattutorial/ImgurAttachmentViewHolder.kt

@@ -26,7 +26,7 @@ class ImgurAttachmentViewHolder(
         }
     }
 
-    override fun bindData(data: MessageListItem.MessageItem, isThread: Boolean, diff: MessageListItemPayloadDiff?) {
+    override fun bindData(data: MessageListItem.MessageItem, diff: MessageListItemPayloadDiff?) {
         data.message.attachments.firstOrNull()?.imageUrl?.let { url ->
             binding.ivMediaThumb.apply {
                 load(url) {