Fix set volume level (#31731)

afsapi requires an `int` in the 0-20 range but we receive a `float` in the 0.0-1.0 range so we have to cast and offset it

homeassistant/components/frontier_silicon/media_player.py

@@ -275,7 +275,7 @@ class AFSAPIDevice(MediaPlayerDevice):
 
     async def async_set_volume_level(self, volume):
         """Set volume command."""
-        await self.fs_device.set_volume(volume)
+        await self.fs_device.set_volume(int(volume * 20))
 
     async def async_select_source(self, source):
         """Select input source."""