unsafe op::mint in jettons

[pyAndr3w]

master_msg scheme is not checked, this may cause total_supply to increase without writing tokens to jetton-wallet

(spoiler) Current op::mint code

    if (op == op::mint()) {
        throw_unless(73, equal_slices(sender_address, admin_address));
        slice to_address = in_msg_body~load_msg_addr();
        int amount = in_msg_body~load_coins();
        cell master_msg = in_msg_body~load_ref();
        slice master_msg_cs = master_msg.begin_parse();
        master_msg_cs~skip_bits(32 + 64); ;; op + query_id
        int jetton_amount = master_msg_cs~load_coins();
        mint_tokens(to_address, jetton_wallet_code, amount, master_msg);
        save_data(total_supply + jetton_amount, admin_address, content, jetton_wallet_code);
        return ();
    }