esp32: Fix setting WLAN channel in AP mode.

- Previously the call to esp_wifi_set_channel() would be immediately
  overridden by calling esp_wifi_config(...) with the previous channel set.

- AP interface doesn't seem to need more than esp_wifi_config(...) to work.
  It will automatically configure 40MHz bandwidth and place the secondary
  channel using similar logic to what was being explicitly calculated here.

- However, calling esp_wifi_set_channel() on the STA interface is necessary
  if using this interface with ESP-NOW (without connecting to an AP). So
  the esp_wifi_set_channel() call is kept in for this purpose. Without
  this, tests/multi_espnow/70_channel.py fails.

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

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