Correctly mark buffers as read

Signed-off-by: Janne Koschinski <janne@kuschku.de>

app/src/main/java/de/kuschku/quasseldroid/service/QuasselService.kt

@@ -162,6 +162,7 @@ class QuasselService : DaggerLifecycleService(),
     val clearMessageId = intent.getIntExtra("mark_read_message", -1)
     if (bufferId != -1 && clearMessageId != -1) {
       sessionManager.session.value?.bufferSyncer?.requestSetLastSeenMsg(bufferId, clearMessageId)
+      sessionManager.session.value?.bufferSyncer?.requestMarkBufferAsRead(bufferId)
     }
   }