bcachefs: clean up one inconsistent indenting

fs/bcachefs/journal_io.c:1843 bch2_journal_write_pick_flush() warn: inconsistent indenting

Reported-by: Abaci Robot <abaci@linux.alibaba.com>
Closes: https://bugzilla.openanolis.cn/show_bug.cgi?id=7585


Signed-off-by: Yang Li <yang.lee@linux.alibaba.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>