libseat 0.9.0 no longer performs an automatic VT switch when taking
control of a seat to allow sessions to be started in the background. As
consequence, one must manually switch if one wants a background session
to be immediately activated.
Issue a chvt on ExecStartPost, when the service is deemed running.
Upstream: https://gitlab.gnome.org/World/Phosh/phosh/-/merge_requests/1566
[ci:skip-build]: already built successfully in CI
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