fix(`securedrop-whonix-config`): depend on `anon-gw-anonymizer-config`

[cfm]

Status

Ready for review

Description

Fixes https://github.com/freedomofpress/securedrop-workstation/pull/1051#pullrequestreview-2097483051.

Test Plan

1. [ ] Build securedrop-whonix-config.
2. [ ] Install directly into whonix-gateway-17.
3. [ ] On sd-whonix, systemctl securedrop-whonix-config shows a successful execution.

Or follow the test plan in https://github.com/freedomofpress/securedrop-workstation/pull/1051#issue-2322099098.

Checklist

If these changes modify code paths involving cryptography, the opening of files in VMs or network (via the RPC service) traffic, Qubes testing in the staging environment is required. For fine tuning of the graphical user interface, testing in any environment in Qubes is required. Please check as applicable:

• [x] I have tested these changes in the appropriate Qubes environment
• I do not have an appropriate Qubes OS workstation set up (the reviewer will need to test these changes)
• These changes should not need testing in Qubes