Fix volume step error in Squeezebox media player (home-assistant#150760)

Author: peteS-UK

homeassistant/components/squeezebox/media_player.py

@@ -326,7 +326,7 @@ async def async_will_remove_from_hass(self) -> None:
     def volume_level(self) -> float | None:
         """Volume level of the media player (0..1)."""
         if self._player.volume is not None:
-            return int(float(self._player.volume)) / 100.0
+            return float(self._player.volume) / 100.0
 
         return None
 
@@ -435,7 +435,7 @@ async def async_turn_off(self) -> None:
 
     async def async_set_volume_level(self, volume: float) -> None:
         """Set volume level, range 0..1."""
-        volume_percent = str(int(volume * 100))
+        volume_percent = str(round(volume * 100))
         await self._player.async_set_volume(volume_percent)
         await self.coordinator.async_refresh()