new url for libzbar; altered config for seedsigner service

[jdlcdl]

Description

While recently rebuilding my manual-build development raspi-os sdcard image, I ran into two problems:

• The expected libzbar file was no longer available, as mentioned/solved in Raspberry Pi OS Local Dev Build Instructions Link to libzbar0_0.23.90-1_armhf.deb is broken #551
• The seedsigner service failed to restart, complaining about syntax with traditional redirection to /dev/null

This pull request is categorized as:

• New feature
• Bug fix
• Code refactor
• Documentation
• Other

Checklist

• I’ve run pytest and made sure all unit tests pass before submitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• No, I’m a fool
• Yes
• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Other

Note: Keep your changes limited in scope; if you uncover other issues or improvements along the way, ideally submit those as a separate PR. The more complicated the PR the harder to review, test, and merge.

[kdmukai]

Download and install of updated libzbar was successful. Was able to scan in a SeedQR so presumably zbar is indeed able to do its thing as expected.

Updated seedsigner.service definition and it looks like it's working fine as well.

Tested ACK.

---

Aside: discovered that macOS Ventura has knocked out the internet-over-usb relay option that I had been using on my dev Pi Zero to reach the outside world (it can still do ssh and rsync kind of stuff back and forth with the Macbook Pro).

[newtonick]

ACK