CTRange: recompute the warm/cool split for the new range

[ryan-ronnander]

I wanted these bulbs to keep their last color temperature and come on at full when the power is physically turned on at the light switch. That means flag 12 plus a startup command of backlog CTRange 154 370; led_dimmer 100; led_enableAll 1. These are four-PWM style bulbs without dedicated cool LEDs, so flag 24 (LED_EMULATE_COOL_WITH_RGB) synthesises cool white from the color channels. Instead they came back at the wrong temperature with the RGB and warm LEDs both lit, where at 2700 K the warm LED should be carrying it alone, pulling ~14 W instead of ~9 W at the wall.

CTRange updates min/max but never recomputes the warm/cool split derived from the old range.

Before

CTRange 154 500        ->  {"1":0, "2":0, "3":0, "5":100}
led_temperature 370    ->  {"1":60,"2":60,"3":60,"5":100}   split computed against 154-500
CTRange 154 370        ->  {"1":60,"2":60,"3":60,"5":100}   <- range changed, split did not
led_temperature 370    ->  {"1":0, "2":0, "3":0, "5":100}   same value, now correct

After

CTRange 154 500        ->  {"1":60,"2":60,"3":60,"5":100}   recomputed for the new range
led_temperature 370    ->  {"1":60,"2":60,"3":60,"5":100}
CTRange 154 370        ->  {"1":0, "2":0, "3":0, "5":100}   recomputed again, no re-issue needed

This happens on every boot when CTRange is in a startup command, since the saved temperature is restored before CTRange runs.

Nothing here is specific to emulated cool white - any device whose range changes after a temperature is set gets the stale split. It is just very noticeable on these four-PWM bulbs, where a wrong cool value lights the color LEDs outright.

bApply is false because true also forces Light_Temperature. I tried that first and a bulb showing red jumped straight to warm white on the next CTRange, so the apply only runs when we are already in temperature mode.

[github-actions]

🎉 This PR is included in version 1.18.313 🎉

The release is available on GitHub release

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