[BackLite] Add button release check

[RKBoss6]

Just checks if the button is released, then cancel the check for long press, to avoid users pressing once, then once more and the screen turns on.

[bobrippling]

Nice find, thanks! Just a couple of little things

[RKBoss6]

This doesn't work, and if you press, release, and then press quickly, it still checks for the button and lights up the screen, even with the checks in place. @bobrippling do you have any idea why that could be?

[bobrippling]

This doesn't work, and if you press, release, and then press quickly, it still checks for the button and lights up the screen, even with the checks in place. @bobrippling do you have any idea why that could be?

I don't think my below suggestion is right unless there's a race between 'clearTimeout()` and the invocation of the timeout func.

If you add debug logs to both the timeout function (each arm of the if) and the setWatch callback, what gets printed?

Suggested change

	longPressTimer=setTimeout(() => {
	if (digitalRead(BTN1)) {
	//set brightness until. locked.
	longPressTimer=setTimeout(() => {
	if (longPressTimer == null) {
	// cancelled, ignore
	return;
	}
	if (digitalRead(BTN1)) {
	//set brightness until. locked.