Enable systemd-time-wait-sync.service and order pacman-init.service after time-sync.target

Merged nl6720 requested to merge nl6720/arch-boxes:pacman-init-after-time-sync into master

If the hardware clock is not in UTC, but instead UTC+X, the pacman keyring may end up with keys created in the future. Ensure the time is synced before starting pacman-init.service.

This fixes the equivalent of archiso's archiso#190 (closed) for arch-boxes.

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