cli: --model overrides unsupported model warning

[MPThLee]

Describe the bug
I was trying to use miio with --model until #1357 is released to stable. As i described there, It shares va2 miot protocols so i'm using that model. But here's what happend.

Unsupported model warning is overridden by --model

Version information (please complete the following information):

• OS: Windows
• python-miio: 0.5.11

Device information:

• Model: zhimi.airp.mb5

To Reproduce
Steps to reproduce the behavior:

1. Use info command on unsupported model with --model.

Expected behavior
It should print real model(not overridden one). I think?

Console output

> python -m miio.cli --debug airpurifiermiot --ip <removed> --token <removed> --model zhimi.airp.va2 info
INFO:__main__:Debug mode active
DEBUG:miio.miioprotocol:Got a response: Container:
    data = Container:
        data = b'' (total 0)
        value = b'' (total 0)
        offset1 = 32
        offset2 = 32
        length = 0
    header = Container:
        data = b'<removed>' (total 16)
        value = Container:
            length = 32
            unknown = 0
            device_id = unhexlify('<removed>')
            ts = <removed>
        offset1 = 0
        offset2 = 16
        length = 16
    checksum = b'\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff' (total 16)
DEBUG:miio.miioprotocol:Discovered <removed>with ts: 1970-01-03 19:57:38, token: b'ffffffffffffffffffffffffffffffff'
DEBUG:miio.miioprotocol:<removed>:54321 >>: {'id': 1, 'method': 'miIO.info', 'params': []}
DEBUG:miio.miioprotocol:<removed>:54321 (ts: <removed>, id: 1) << {'id': 1, 'result': {'life': <removed>, 'uid': <removed>, 'model': 'zhimi.airp.mb5', 'token': '<removed>', 'ipflag': 1, 'fw_ver': '2.2.1', 'mcu_fw_ver': '0023', 'miio_ver': '0.0.9', 'hw_ver': 'esp32', 'mmfree': <removed>, 'mac': '<removed>', 'wifi_fw_ver': '', 'ap': {'ssid': '<removed>', 'bssid': <removed>', 'rssi': -39, 'primary': 10}, 'netif': {'localIp': '<removed>', 'mask': '<removed>', 'gw': '<removed>'}}, 'exe_time': 50}
DEBUG:miio.device:Detected model zhimi.airp.mb5
WARNING:miio.device:Found an unsupported model 'zhimi.airp.va2' for class 'AirPurifierMiot'. If this is working for you, please open an issue at https://github.com/rytilahti/python-miio/
Model: zhimi.airp.mb5
Hardware version: esp32
Firmware version: 2.2.1