telegram-chat: delay confirmation of updates

Several devices can communicate with the same bot, and we want all of
them to receive their updates. However this can be tricky, as...

* ... sometimes internet connection can be unreliable or saturated.
* ... device can be busy with long running command.
* ... the Telegram bot api servers seem to implement what ever kind of
  rate limiting. Anybody can give details?

So let's confirm the update id after third request only. 😁 This gives
delayed devices some extra chances to catch up.

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