daily update timer: start already on 01:00 to avoid dst change issue

daily update timer: start already on 01:00 to avoid dst change issue

see https://github.com/systemd/systemd/issues/5595

Has also the side effect of spreading out the updates for our most
used product over a longer time span, reducing load on the CDN.

Note, this is now the same timer setting as PBS used from the start.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
(cherry picked from commit f703b171e6ef7d06a3b751c50ed3d421db99fd45)
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>