fix(archsetup): install fontconfig and dconf before calling them

The 2026-05-11 VM test surfaced three exit-127 / "dbus-launch returned 1" errors very early in the run: `fc-cache` and the two `dconf` writes in `user_customizations()`. The function runs as step 4 of 13 (before `aur_installer`, the DE step, and most of the package installs), so the binaries the function calls are not on PATH yet.

I added `pacman_install fontconfig` and `pacman_install dconf` right before their use, mirroring the existing `pacman_install desktop-file-utils` pattern in the same function. Both are idempotent. Verified by `bash -n`. The next `make test` run confirms the behavior in the VM.

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