actually load contact info before sending a task message.

[wxtim]

This is a small change with no associated Issue - description of issue here:

@dpmatthews noticed that a remote platform was not picking up custom settings for task messaging. It appears that these settings aren't loaded from the contact file before they are set for the task messaging app.

Requirements 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.py and
  conda-environment.yml.
• Does not need tests (to be manually tested?).
• Appropriate change log entry included.
• No documentation update required: Part of a soon to be deprecated branch of Cylc.

[oliver-sanders]

Looks good, I haven't yet tested it.

[hjoliver]

Damn, we need another Cylc 7 release.

[oliver-sanders]

Damn, we need another Cylc 7 release.

We could do with putting this in it too:

#4516

[datamel]

I have read the code, checked out the branch and run with a test suite.
I can confirm the branch works as expected and I am happy with the change.

Special thanks to @wxtim for providing me with his test suite and the tips on getting it up and running!

[datamel]

Looks good, I haven't yet tested it.

I will leave the merge for you to finish tests @oliver-sanders. I've done a manual check but you may wish to do one yourself.

[wxtim]

I have read the code, checked out the branch and run with a test suite. I can confirm the branch works as expected and I am happy with the change.

Special thanks to @wxtim for providing me with his test suite and the tips on getting it up and running!

It was Dave's test suite.