fix(aht20): raw humidity/temperature data conversion (AEGHB-505)

[kylecmarshall]

Concerning the conversion of raw_data to humidity/temperature:

humidity = raw_data * 100 / 1048576 gives a max humidity of 99.99990

To get a max humidity of 100:
humidity = raw_data * 100 / 1048575

Similar arguments can be made for the temperature.

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👋 Hello kylecmarshall, we appreciate your contribution to this project!

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[leeebo]

@kylecmarshall Thanks, your modifications make sense, we will accept soon

[kylecmarshall]

@leeebo I reviewed the datasheet for the AHT20. It very clearly shows that you are supposed to divide by 2^20. I looked at Adafruit's implementation: they also divide by 2^20. So please disregard this change.

[leeebo]

@kylecmarshall OK, thanks for your feedback, let's just close this PR