[teamcity/gitian] Do not remove src tarball from results
Reasons to delete the src tarball:
- Save disk space
Reasons to keep it:
- Easily package a release from TeamCity (if needed)
- Verify and/or manually test the src tarball.
- TeamCity automatically cleans up old build artifacts, so disk space is not really an issue.
I'm in favor of keeping it.
Test Plan: TeamCity gitian build (see comments)
Reviewers: #bitcoin_abc, deadalnix, Fabien
Reviewed By: #bitcoin_abc, Fabien
Differential Revision: https://reviews.bitcoinabc.org/D3864