Fix error introduced by #21933 (#21988)

homeassistant/components/homekit_controller/cover.py

@@ -236,7 +236,7 @@ async def async_open_cover(self, **kwargs):
         """Send open command."""
         await self.async_set_cover_position(position=100)
 
-    async def close_cover(self, **kwargs):
+    async def async_close_cover(self, **kwargs):
         """Send close command."""
         await self.async_set_cover_position(position=0)