xfs: enable online fsck by default in Kconfig

Online fsck has been a part of upstream for over a year now without any
serious problems.  Turn it on by default in time for the 2025 LTS
kernel, and get rid of the "say N if unsure" messages for the default Y
options.

Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com>