io_uring: remove redundant tab space

When show fdinfo, SqMask follow two tab space, which is inconsistent with
other parameters. Remove one, so it lines up nicely.

Signed-off-by: GuoYong Zheng <zhenggy@chinatelecom.cn>
Link: https://lore.kernel.org/r/1641377585-1891-1-git-send-email-zhenggy@chinatelecom.cn


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