Bug#968014: systemd 246 postinst script should restart systemd-logind.service

[Zygmunt Krynicki]

Package: systemd
Version: 246-2

Updating systemd to 246-2 leaves systemd-logind.service from 245-* which breaks certain operations. 

One such example is, (assuming user foo): loginctl enable-linger foo. Without restarting systemd-logind.service this command fails with the following error:

Aug 06 17:08:06 aug061652-827018 systemd-user-runtime-dir[28557]: Failed to acquire number of inodes for runtime directory: Unknown interface org.freedesktop.login1.Manager or property RuntimeDirectoryInodesMax.

Looking at the systemd.postinst script I can see that systemd-logind is not restarted on purpose, referencing upstream systemd bug https://github.com/systemd/systemd/issues/1163. This bug is closed now so I suspect the proper action is to simply restart systemd-logind.service. I've attached a crude patch with that change.
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