When I read the
[building-desktop-client-app.md](https://github.com/toeverything/AFFiNE/blob/canary/docs/building-desktop-client-app.md)
to build Artifacts locally, I find there have some legacy path due to
some project structure updates.
So this is a litte fix to correct the unmatched path in the doc.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Documentation**
* Updated desktop client app building documentation to reflect changes
in the project structure and configuration setup.
<sub>✏️ Tip: You can customize this high-level summary in your review
settings.</sub>
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