whisper : set no_context == true by default (#537)

examples/stream/stream.cpp

@@ -288,7 +288,6 @@ int main(int argc, char ** argv) {
             wparams.print_realtime   = false;
             wparams.print_timestamps = !params.no_timestamps;
             wparams.translate        = params.translate;
-            wparams.no_context       = true;
             wparams.single_segment   = !use_vad;
             wparams.max_tokens       = params.max_tokens;
             wparams.language         = params.language.c_str();

whisper.cpp

@@ -2913,7 +2913,7 @@ struct whisper_full_params whisper_full_default_params(enum whisper_sampling_str
         /*.duration_ms      =*/ 0,
 
         /*.translate        =*/ false,
-        /*.no_context       =*/ false,
+        /*.no_context       =*/ true,
         /*.single_segment   =*/ false,
         /*.print_special    =*/ false,
         /*.print_progress   =*/ true,