Fix incorrectly reported volume when using .5 as volume step

Fixes the volume displayed on the remote so that it isn't constantly .5 too high

intg-denonavr/avr.py

@@ -8,6 +8,7 @@
 import asyncio
 import logging
 import time
+import math
 from asyncio import AbstractEventLoop, Lock
 from enum import IntEnum
 from functools import wraps
@@ -591,6 +592,14 @@ async def _telnet_callback(self, zone: str, event: str, parameter: str) -> None:
             level = self.volume_level
             if level is None:
                 level = int(parameter)
+
+            # remote only displays integers, subtract .5 if volume step is 0.5 so that the displayed volume 
+            # remains within the same integer when pressing once
+            # remote only displays integers, round down to the nearest integer
+            # so that the remote doesn't round up to a higher integer
+            if self._volume_step == 0.5:
+                level = math.floor(level)
+
             self.events.emit(Events.UPDATE, self.id, {MediaAttr.VOLUME: level})
         elif event == "MU":  # Muted
             self._set_expected_state(States.ON)