Do not send light_on value to iot bulb set_state (#1090)

Passing this extra value caused the `ignore_default` check in the `IotBulb._set_light_state`
method to fail which causes the device to come back on to the default state.

kasa/iot/iotbulb.py

@@ -326,6 +326,7 @@ class IotBulb(IotDevice):
         self, state: dict, *, transition: int | None = None
     ) -> dict:
         """Set the light state."""
+        state = {**state}
         if transition is not None:
             state["transition_period"] = transition
 

kasa/iot/modules/light.py

@@ -230,6 +230,8 @@ class Light(IotModule, LightInterface):
                 state_dict["on_off"] = 1
             else:
                 state_dict["on_off"] = int(state.light_on)
+            # Remove the light_on from the dict
+            state_dict.pop("light_on", None)
             return await bulb._set_light_state(state_dict, transition=transition)
 
     @property

kasa/tests/test_bulb.py

@@ -9,7 +9,7 @@ from voluptuous import (
     Schema,
 )
 
-from kasa import Device, DeviceType, IotLightPreset, KasaException, Module
+from kasa import Device, DeviceType, IotLightPreset, KasaException, LightState, Module
 from kasa.iot import IotBulb, IotDimmer
 
 from .conftest import (
@@ -96,6 +96,22 @@ async def test_set_hsv_transition(dev: IotBulb, mocker):
     )
 
 
+@bulb_iot
+async def test_light_set_state(dev: IotBulb, mocker):
+    """Testing setting LightState on the light module."""
+    light = dev.modules.get(Module.Light)
+    assert light
+    set_light_state = mocker.spy(dev, "_set_light_state")
+    state = LightState(light_on=True)
+    await light.set_state(state)
+
+    set_light_state.assert_called_with({"on_off": 1}, transition=None)
+    state = LightState(light_on=False)
+    await light.set_state(state)
+
+    set_light_state.assert_called_with({"on_off": 0}, transition=None)
+
+
 @color_bulb
 @turn_on
 async def test_invalid_hsv(dev: Device, turn_on):