Update callback_bot.py

[olivka86]

Неполный путь до ключа from_id

{
    "type": "message_new",
    "object": {
        "message": {
            "date": *date*,
            "from_id": *from_id*,
            "id": 0,
            "out": 0,
            "attachments": [],
            "conversation_message_id": *conversation_message_id*,
            "fwd_messages": [],
            "important": false,
            "is_hidden": false,
            "peer_id": 2000000001,
            "random_id": 0,
            "text": "cat"
        }
 ....