Rsync Fix

[datamel]

Rsync has backported an update which breaks job log retrieval due to $HOME being present in the command.

This is essentially the Cylc 7 fix for: #5115

Check List

• I have read CONTRIBUTING.md and added my name as a Code Contributor.
• Contains logically grouped changes (else tidy your branch by rebase).
• Does not contain off-topic changes (use other PRs for other changes).
• Applied any dependency changes to both setup.cfg and conda-environment.yml.
• Tests are included (or explain why tests are not needed).
• CHANGES.md entry included if this is a change that can affect users
• Cylc-Doc pull request not required.
• If this is a bug fix, PRs raised to both master and the relevant maintenance branch.

[dpmatthews]

Closes #5133