WPB-20053: fix Brig's emails templates fetch script

[blackheaven]

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[supersven]

If you've tried it (i.e. it works, which I haven't tested), fine by me 👍

[supersven]

@blackheaven Please take care of the checklist in this PR. Adding a changelog entry would be good.

[blackheaven]

added, thanks :)

[Copilot]

Pull request overview

This PR attempts to fix Brig's email templates fetch script by updating the path to the templates directory. The script previously looked for templates in a local subdirectory, but the change redirects it to libs/wire-subsystems/templates to reflect the actual location of email templates in the repository.

Key changes:

• Updates the templates path variable in the fetch script to point to the shared templates location
• Adds a changelog entry documenting the bug fix

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
services/brig/deb/opt/brig/bin/fetch.py	Updates the templates directory path to point to libs/wire-subsystems/templates
changelog.d/3-bug-fixes/WPB-20053	Adds changelog entry for the bug fix

Critical Issue Identified: The path construction in fetch.py is incorrect - it only goes up 2 directory levels when it needs to go up 5 levels to reach the repository root where the libs/ directory is located.

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