fix: ADC button tied to GND ignored (AEGHB-691)

[demianzenkov]

Bug: if there is an ADC button in the group which is tied to GND the read value is ignored and callbacks do not work. SW2 on attached screenshot cannot be enabled.
Reason: adc_button_config.min = 0 is not included in the condition.
Fix: include adc_button_config.min = 0 in button_adc_get_key_level method.

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

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[leeebo]

@demianzenkov Thanks for your contribution. It is recommended to release a new bugfix package 3.2.0 -> 3.2.1

1. change the version number in https://github.com/espressif/esp-iot-solution/blob/master/components/button/idf_component.yml#L1
2. update changelog https://github.com/espressif/esp-iot-solution/blob/master/components/button/CHANGELOG.md

[leeebo]

@demianzenkov LGTM!

[leeebo]

sha=c089dd8b1deae5ff66919dec581f1f5cf10d0708