Fix var name in service bus function

...i am a horrible programmer

Author: snobu

v2functions/sbqueue-trigger-sbqueue-out-binding/__init__.py

@@ -4,4 +4,4 @@
 def main(msgIn: func.ServiceBusMessage, msgOut: func.Out[str]):
     body = msgIn.get_body().decode('utf-8')
     logging.info(f'Processed Service Bus Queue message: {body}')
-    msgOut.set(msgbody)
+    msgOut.set(body)