aio-pika instrumentation: Removed check for non-sampled span when inj…

…ect message headers. Reason to change is that sampled flag can be propagate https://www.w3.org/TR/trace-context/#sampled-flag and be useful when trace is not sampled.

instrumentation/opentelemetry-instrumentation-aio-pika/src/opentelemetry/instrumentation/aio_pika/publish_decorator.py

@@ -45,8 +45,7 @@ async def decorated_publish(
             if not span:
                 return await publish(message, routing_key, **kwargs)
             with trace.use_span(span, end_on_exit=True):
-                if span.is_recording():
-                    propagate.inject(message.properties.headers)
+                propagate.inject(message.properties.headers)
                 return_value = await publish(message, routing_key, **kwargs)
             return return_value