refac: openai already supports webm audio

backend/open_webui/routers/audio.py

@@ -86,8 +86,7 @@ def get_audio_format(file_path):
         return "mp4"
     elif info.get("format_name") == "ogg":
         return "ogg"
-    elif info.get("format_name") == "matroska,webm":
-        return "webm"
+
     return None