seccomp: drop quotactl_path() again from filter sets

In the light of https://lwn.net/Articles/859679/ let's drop
quotactl_path() again from the filter set list, as it got backed out
again in 5.13-rc3.

It's likely going to be replaced by quotactl_fd() eventually, but that
hasn't made its way into the tree yet, hence let's not replace the entry
for now.

This partially reverts 34254e59.