user service cannot depend on multi-user (system) target

[petersilva]

ugh... got these error messages:

pas037@hpfx3:~/.config/systemd/user$ systemctl --user enable metpx-sr3_user
 ...
Unit /home/pas037/.config/systemd/user/metpx-sr3_user.service is added as a dependency to a non-existent unit multi-user.target.
...
pas037@hpfx3:~/.config/systemd/user$

Googled a bit, I think this means that it will not be started on boot. a user level systemd service cannot depend on a
system-wide one. I tried removing the [Install] stanza, but that broke it... so changed the target to default.target after
googling. That should make it start on boot.

[petersilva]

the tests are irrelevant. They don't test this change.