ESP32C3 fix ledc_channel_config(847): sleep_mode argument invalid

[bisak]

Hi, quick PR here.

This was the only way I was able to make this board work -> https://www.espboards.dev/esp32/esp32-c3-super-mini-plus/

No matter which pins I used, I was intermittently 3 out of 5 boots getting the following error:

EP32-DRV: Configuring 3PWM
EP32-DRV: 3PWM setup in group: 0
E (290) ledc: ledc_channel_config(847): sleep_mode argument is invalid
EP32-DRV: ERROR - Failed to attach channel:0
EP32-DRV: ERROR - Failed to configure pin:1

This PR fixes it. I don't know if this is a good solution, but works bulletproof for the C3 board in quesiton.

Open to discuss. Thanks.