Add define to set data pins to HIGH when relay is off

[c3n]

I'm using an IRF3708 MOSFET instead of a relay to disconnect the LEDs when WLED is off. Since it only disconnects GND and not +5V a LOW on the data pin creates a small leakage current which I didn't want. On ESP8266 the LED gets turned off so if the pin is shared with data there is no problem. This PR adds a compile-time define (that one could set in the .ini file) that switches all configured digital data pins on ESP32 to HIGH using rmt_set_idle_level whlie the relay is off. Tested with 2 SK6812 Strips connected to an esp32

[stale[bot]]

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[blazoncek]

What happens if first bus is not RMT driven? (AKA APA102 LEDs which use SPI)

[softhack007]

Hi,

Since it only disconnects GND and not +5V

Is there a specific reason why you disconnect GND instead if disconnecting 5V?

[c3n]

Yes, I used a MOSFET to disconnect the LED strip instead of a relay and don't need to worry about 3.3V/5V