Fix SP1 status text

[lausser]

Hi,
i was using your decoder because of the "Definition of head line daily value", but still the packets i received showed no sp1_decode field and status_decoded was still false. Then i saw:
studierendenwerk-ulm#1 (comment)
After using bytes[2] << 8 | bytes[1] i got better results

{
    "port": 1,
    "packet_type": 1,
    "packet_subtype": 0,
    "packet_type_info": "synchronous",
    "status_decoded": false,
    "status_info": "payload_raw: 11 00 80 00 00",
    "sp1_decode": "S_REMOVAL_DETECTION"
}

The status is fine, because the smoke detector is here on my desk and is not snapped in the ground plate.