Revert "Updated engines.sound.Sound.duration to use engine_tool instead of engine_sound."

This reverts commit bc4b1de.

Author: Ayuto

addons/source-python/packages/source-python/engines/sound.py

@@ -14,7 +14,6 @@
 from core import AutoUnload
 #   Engines
 from engines import engines_logger
-from engines.tools import engine_tool
 #   Entities
 from entities.constants import INVALID_ENTITY_INDEX
 #   Filters
@@ -179,7 +178,7 @@ def sample(self):
     @property
     def duration(self):
         """Return the duration of the sample."""
-        return engine_tool.get_sound_duration_by_path(self.sample)
+        return engine_sound.get_sound_duration(self.sample)
 
     def _unload_instance(self):
         """Remove the sample from the downloads list."""