fix copy paste error in publisher example

Author: Ian-Nara

examples/sample_token_generate_refresh.py

@@ -60,7 +60,7 @@ def _usage():
     exit(1)
 
 
-if(token_generate_response.is_optout()):
+if(token_refresh_response.is_optout()):
     print("User has opted out")
     exit(0)