fix: AHT20 - remove incorrect check for CRC bit (AEGHB-1314)

[SvenRH]

Description

There was a incorrect check for a CRC bit in the response from the sensor.

This bit is NOT defined in the datasheet and some versions of the chip don't set this bit.

Related

Datasheet

Testing

As it's just the removable of a wrong check, I just tested it in my test project,

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[leeebo]

@SvenRH This may be because the component is developed for both AHT20 and AHT30 (as declared in https://github.com/espressif/esp-iot-solution/tree/master/components/sensors/humiture/aht20#component-aht20),

While Espressif CI only tests with the AHT30, the issue is not exposed

[leeebo]

Suggest keeping this MARCO defined, but specify the AHT30 in the comment

[leeebo]

@SvenRH LGTM! nitpick, please update the component's CHANGELOG.md also