B-497: fix vmgroup anti-affinity variable name at read

[treywelsh]

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Description

An error in the development of the VM group resource lead to an error during read step.

References

Close #497

New or Affected Resource(s)

• opennebula_vm_group

Checklist

• [ ] I have created an issue and I have mentioned it in References
• [ ] My code follows the style guidelines of this project (use go fmt)
• [ ] My changes generate no new warnings or errors
• [ ] I have updated the unit tests and they pass succesfuly
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have updated the documentation (if needed)
• [ ] I have updated the changelog file

[github-actions[bot]]

This pull request is stale because it has been open for 30 days with no activity and it is not in a milestone. Remove 'status: stale' label or comment, or this will be closed in 5 days.

[github-actions[bot]]

This pull request is stale because it has been open for 30 days with no activity and it is not in a milestone. Remove 'status: stale' label or comment, or this will be closed in 5 days.