Fix switching off light effects for iot lights strips (#961)

Fixes the newly implemented method to turn off active effects on iot devices

kasa/iot/modules/lighteffect.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from ...interfaces.lighteffect import LightEffect as LightEffectInterface
+from ...module import Module
 from ..effects import EFFECT_MAPPING_V1, EFFECT_NAMES_V1
 from ..iotmodule import IotModule
 
@@ -59,19 +60,24 @@ class LightEffect(IotModule, LightEffectInterface):
         :param int transition: The wanted transition time
         """
         if effect == self.LIGHT_EFFECTS_OFF:
-            effect_dict = dict(self.data["lighting_effect_state"])
-            effect_dict["enable"] = 0
+            light_module = self._device.modules[Module.Light]
+            effect_off_state = light_module.state
+            if brightness is not None:
+                effect_off_state.brightness = brightness
+            if transition is not None:
+                effect_off_state.transition = transition
+            await light_module.set_state(effect_off_state)
         elif effect not in EFFECT_MAPPING_V1:
             raise ValueError(f"The effect {effect} is not a built in effect.")
         else:
             effect_dict = EFFECT_MAPPING_V1[effect]
 
-        if brightness is not None:
-            effect_dict["brightness"] = brightness
-        if transition is not None:
-            effect_dict["transition"] = transition
+            if brightness is not None:
+                effect_dict["brightness"] = brightness
+            if transition is not None:
+                effect_dict["transition"] = transition
 
-        await self.set_custom_effect(effect_dict)
+            await self.set_custom_effect(effect_dict)
 
     async def set_custom_effect(
         self,