Support color sync

This allows the color sync functionality to work if it's enabled in the
device settings.

devices/lidl.js

@@ -149,7 +149,7 @@ const tzLocal = {
         key: ['brightness', 'color', 'color_temp', 'transition'],
         options: [exposes.options.color_sync()],
         convertSet: async (entity, _key, _value, meta) => {
-            const newState = {};
+            let newState = {};
 
             // The color mode encodes whether the light is using its white LEDs or its color LEDs
             let colorMode = meta.state.color_mode ?? colorModeLookup[ColorMode.ColorTemp];
@@ -234,6 +234,10 @@ const tzLocal = {
                 }
             }
 
+            // If we're in white mode, calculate a matching display color for the set color temperature. This also kind
+            // of works in the other direction.
+            newState = libColor.syncColorState(newState, meta.state, entity, meta.options, meta.logger);
+
             return {state: newState};
         },
         convertGet: async (entity, key, meta) => {