Implement missing restore feature for RandomGhosting

[fepegar]

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Fixes #1196.

Description

As reported by @sravan953, the restore argument in RandomGhosting is unused. This PR addresses this issue.

Checklist

• [x] I have read the CONTRIBUTING docs and have a developer setup (especially important are pre-commitand pytest)
• [x] Non-breaking change (would not break existing functionality)
• [ ] Breaking change (would cause existing functionality to change)
• [ ] Tests added or modified to cover the changes
• [ ] Integration tests passed locally by running pytest
• [x] In-line docstrings updated
• [ ] Documentation updated, tested running make html inside the docs/ folder
• [ ] This pull request is ready to be reviewed