[Request]: Support for single-channel PWM lights

[bratoff]

What would you like implemented?

I am attempting to control a WLED node that is connected to a set of white-only LEDs in PWM mode. WLED has a setting for this, which treats channel 1 as a white channel. Using the Android app or the WLED web page I can leave the white channel turned all the way up and then use the brightness slider to control the LEDs.

When I attempt to do this in Octoprint-WLED, there is no white channel. Even worse, any command sent by the plugin to the node sets the white channel to 0, turning the lights completely off.

I would like to see the plugin correctly recognize the node's LED configuration and provide the appropriate numberr of channels, be it 1 (white only), 3 (RGB) or 4 (RGBW).