Nexus: set correct cusp in SOC jastrow

[camelto2]

Please review the developer documentation
on the wiki of this project that contains help and requirements.

Proposed changes

Set correct cusp in two body jastrow when spinors are enabled so the user doesn't have to

What type(s) of changes does this code introduce?

Delete the items that do not apply

• New feature

Does this introduce a breaking change?

• No

What systems has this change been tested on?

M1 mac

Checklist

Update the following with a yes where the items apply. If you're unsure about any of them, don't hesitate to ask. This is
simply a reminder of what we are going to look for before merging your code.

• Yes. This PR is up to date with current the current state of 'develop'
• Yes. Code added or changed in the PR has been clang-formatted
• No. This PR adds tests to cover any new code, or to catch a bug that is being fixed
• Yes. Documentation has been added (if appropriate)

[ye-luo]

Test this please