Fix line wrapping/padding issues

It should now parse messages with newlines properly as well as messages that
contain long sequences of characters with no spaces

src/message_queue.c

@@ -88,6 +88,7 @@ static void cqueue_mark_read(ToxWindow *self, struct cqueue_msg *msg)
 
         if (line->noread_flag == true) {
             line->len -= 2;
+            line->msg_len -= 2;
             line->noread_flag = false;
         }