Xpra: Ticket #2586: re-enable systemd-run by default

Following ticket:2585#comment:1 : in "auto" mode we now test it before trying to use it, so it should be safe to enable everywhere.

See also: #1105, #2042, #1536.

Tue, 11 Feb 2020 04:56:32 GMT - Antoine Martin: status changed; resolution set

Done in r25208.

Sat, 23 Jan 2021 05:55:20 GMT - migration script:

this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/2586