Remove volume_up/volume_down overrides from clementine media player

Set _attr_volume_step to 0.04 (4/100) and let the base class handle
volume stepping. The device uses a 0-100 raw range with steps of 4,
which translates to 0.04 in the 0..1 HA volume scale.

https://claude.ai/code/session_01Gn8AeZ8HvyyDw53e1rynUA

homeassistant/components/clementine/media_player.py

@@ -66,6 +66,7 @@ class ClementineDevice(MediaPlayerEntity):
         | MediaPlayerEntityFeature.SELECT_SOURCE
         | MediaPlayerEntityFeature.PLAY
     )
+    _attr_volume_step = 0.04
 
     def __init__(self, client, name):
         """Initialize the Clementine device."""
@@ -124,16 +125,6 @@ class ClementineDevice(MediaPlayerEntity):
 
         return None, None
 
-    def volume_up(self) -> None:
-        """Volume up the media player."""
-        newvolume = min(self._client.volume + 4, 100)
-        self._client.set_volume(newvolume)
-
-    def volume_down(self) -> None:
-        """Volume down media player."""
-        newvolume = max(self._client.volume - 4, 0)
-        self._client.set_volume(newvolume)
-
     def mute_volume(self, mute: bool) -> None:
         """Send mute command."""
         self._client.set_volume(0)