rnbd: don't set QUEUE_FLAG_SAME_COMP

QUEUE_FLAG_SAME_COMP is already set by default.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://lore.kernel.org/r/20240627124926.512662-5-hch@lst.de


Signed-off-by: Jens Axboe <axboe@kernel.dk>