Update sv run script for moby to remove loop modprobe check.

[sbromberger]

Remove modprobe -q loop || exit 1 to enable docker to work within containers, where kernel modules may not exist/be loadable. The absence of the loop kmod does not appear to negatively impact docker running within a container.

Note: to run in containers, the rest of the script doesn't work either: adding mount -t cgroup2 cgroup2 /sys/fs/cgroup/ to /etc/rc.local makes things work without issue. Modifying the systemd mountpoint check is too big a change to propose without extensive testing so I haven't included it as part of this PR.

Testing the changes

• I tested the changes in this PR: YES*
  Note: tested within a container only; I do not have access to void running on metal.

Local build testing

• I built this PR locally for my native architecture, Linux boron 6.0.13_1 #1 SMP PREEMPT_DYNAMIC Fri Dec 16 02:05:26 UTC 2022 x86_64 GNU/Linux (glibc)

[sbromberger]

Closing pending void-linux/void-runit#101 where we'll be able to do something more intelligent here.