fix: whisper language choice, test=asr (#2828)

Author: cxumol

paddlespeech/s2t/models/whisper/whipser.py

@@ -476,7 +476,7 @@ def transcribe(
         decode_options["fp16"] = False
 
     if decode_options.get(
-            "language", 'None') or decode_options.get("language", None) is None:
+            "language") == 'None' or decode_options.get("language", None) is None:
         if not model.is_multilingual:
             decode_options["language"] = "en"
         else: