LIFX: refresh state after stopping an effect

This clears the internal cache in case polling picked up the state as set by
an effect.

For example, aborting an effect by selecting a new brightness could keep a
color set by the effect.

homeassistant/components/light/lifx/effects.py

@@ -205,6 +205,7 @@ class LIFXEffect(object):
                     light.device.set_color(light.effect_data.color)
                     yield from asyncio.sleep(0.5)
                 light.effect_data = None
+                yield from light.refresh_state()
             self.lights.remove(light)
 
     def from_poweroff_hsbk(self, light, **kwargs):