Fix template fan turn_on action (#27181)

* Fix template fan turn_on action

The turn_on action of a template fan should
receive the 'speed' attribute in order to give
the user the possibility of define the behaviour
of this action as he desires

Fixes #27176

* Format

* Update fan.py

homeassistant/components/template/fan.py

@@ -270,7 +270,7 @@ class TemplateFan(FanEntity):
     # pylint: disable=arguments-differ
     async def async_turn_on(self, speed: str = None) -> None:
         """Turn on the fan."""
-        await self._on_script.async_run(context=self._context)
+        await self._on_script.async_run({ATTR_SPEED: speed}, context=self._context)
         self._state = STATE_ON
 
         if speed is not None: