d/haveged.service: do not order After=systemd-random-seed.service

Commit 6e04e096 added systemd service file ordering to start haveged early during boot. These changes to the service file were not included in the systemd service files that upstream haveged provides, and are used only by debian/ubuntu and opensuse.

Upstream systemd has recently changed systemd-random-seed.serivce to no longer be ordered before sysinit.target: https://github.com/systemd/systemd/commit/60ab2d1a4b3b927ad4536d0d8fb4609fb4053d62

However, since haveged orders itself After=systemd-random-seed and also Before=sysinit.service, it is now causing boot delays: https://github.com/systemd/systemd/issues/13252

This commit leaves all the early-boot ordering, except ordering after systemd-random-seed.service, which is what was causing the boot delays.