Update inference.py

inference.py

@@ -199,7 +199,7 @@ def proc_folder(args=None, progress=None):
         parser.add_argument("--overlap", type=int, default=2, help=i18n("overlap_help"))
         parser.add_argument("--export_format", type=str, default='wav FLOAT', choices=['wav FLOAT', 'flac PCM_16', 'flac PCM_24'], help=i18n("export_format_help"))
         parser.add_argument("--demud_phaseremix_inst", action='store_true', help=i18n("demud_phaseremix_help"))
-        parser.add_argument("--extract_instrumental", "action='store_true', help=i18n("extract_instrumental_help"))
+        parser.add_argument("--extract_instrumental", action='store_true', help=i18n("extract_instrumental_help"))
         parser.add_argument("--use_tta", action='store_true', help=i18n("use_tta_help"))
         parser.add_argument("--flac_file", action='store_true', help=i18n("flac_file_help"))
         parser.add_argument("--pcm_type", type=str, choices=['PCM_16', 'PCM_24'], default='PCM_24', help=i18n("pcm_type_help"))