Fix old lights with color temperature but no white support #86
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ESPHome never supported this, and no built-in lights used this, but apparently it was used by third-party components. Without this fix, those lights would show up as on-off lights in HA. Make them RGBCT lights, which doesn't fit perfectly as they don't expect a white value, but they already had that in pre-2021.8 HA anyway and it's better than being totally broken.