use X-Chat-Last-Common-Read to fix read status

Without this commit, the read status was broken as X-Chat-Last-Common-Read was not used. It was removed by
https://github.com/nextcloud/talk-android/pull/3630

As a result all messages were marked as unread after waiting for 30 seconds.

With this commit the X-Chat-Last-Common-Read is used again.
Messages are marked as read again also after 30 seconds.

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

app/src/main/java/com/nextcloud/talk/chat/ChatActivity.kt

@@ -918,7 +918,11 @@ class ChatActivity :
                                 collapseSystemMessages()
                             }
 
-                            updateReadStatusOfAllMessages(chatMessageList[0].jsonMessageId)
+                            val newXChatLastCommonRead = state.response.headers()["X-Chat-Last-Common-Read"]?.let {
+                                Integer.parseInt(it)
+                            }
+
+                            updateReadStatusOfAllMessages(newXChatLastCommonRead)
 
                             processCallStartedMessages(chatMessageList)
 
@@ -927,7 +931,7 @@ class ChatActivity :
                             chatViewModel.refreshChatParams(
                                 setupFieldsForPullChatMessages(
                                     true,
-                                    chatMessageList[0].jsonMessageId,
+                                    newXChatLastCommonRead,
                                     true
                                 )
                             )