[deconz] properly initialize colorMode (#9583)

Signed-off-by: Jan N. Klug <jan.n.klug@rub.de>

bundles/org.openhab.binding.deconz/src/main/java/org/openhab/binding/deconz/internal/handler/LightThingHandler.java

@@ -116,6 +116,9 @@ public class LightThingHandler extends DeconzBaseThingHandler {
                 needsPropertyUpdate = true;
             }
         }
+        ThingConfig thingConfig = getConfigAs(ThingConfig.class);
+        colorMode = thingConfig.colormode;
+
         super.initialize();
     }