updated variables in python files

Author: Dan-Flores

src/torchcodec/_core/Encoder.h

@@ -47,11 +47,8 @@ class AudioEncoder {
   UniqueAVCodecContext avCodecContext_;
   int streamIndex_;
   UniqueSwrContext swrContext_;
-
   AudioStreamOptions audioStreamOptions;
 
-  int outNumChannels_ = -1;
-
   // TODO-ENCODING: desiredNumChannels should just be part of an options struct,
   // see other TODO above.
   int desiredNumChannels_ = -1;