Telegram bot: Fix deprecated method usage and simplify code

core/src/main/java/es/urjc/etsii/grafo/services/messaging/TelegramService.java

@@ -109,40 +109,22 @@ private static class MorkTelegramBot extends TelegramLongPollingBot {
          */
         private final String chatId;
 
-        /**
-         * bot's token for communicating with the Telegram server
-         */
-        private final String token;
-
         /**
          * Constructor
          *
          * @param chatId  chat id
-         * @param token   token
          * @param options options
          */
         private MorkTelegramBot(String chatId, String token, DefaultBotOptions options) {
-            super(options);
+            super(options, token);
             this.chatId = chatId;
-            this.token = token;
         }
 
         @Override
         public String getBotUsername() {
             return "MorkTelegramIntegration";
         }
 
-
-        /**
-         * This method returns the bot's token for communicating with the Telegram server
-         *
-         * @return the bot's token
-         */
-        @Override
-        public String getBotToken() {
-            return token;
-        }
-
         /**
          * Method for receiving messages.
          *