Disabling fstrim.timer was for avoid running fstrim on /var/lib/scylla from
both scylla-fstrim.timer and fstrim.timer, but fstrim.timer actually never do
that, since it is only looking on fstab entries, not our systemd unit.
To run fstrim correctly on rootfs and other filesystems not related
scylla, we should stop disabling fstrim.timer.
Fixes#15176
Signed-off-by: Takuya ASADA <syuu@scylladb.com>
Closes#15177
ae25a216bc