Fix and consolidate command workspace resolution

autogpt/commands/audio_text.py

@@ -2,15 +2,13 @@ import requests
 import json
 
 from autogpt.config import Config
-from autogpt.commands.file_operations import safe_join
+from autogpt.workspace import path_in_workspace
 
 cfg = Config()
 
-working_directory = "auto_gpt_workspace"
-
 
 def read_audio_from_file(audio_path):
-    audio_path = safe_join(working_directory, audio_path)
+    audio_path = path_in_workspace(audio_path)
     with open(audio_path, "rb") as audio_file:
         audio = audio_file.read()
     return read_audio(audio)