fix(pavu): incorrect pavucontrol class

[rubiin]

Pull Request

Description

Please read these instructions and remove unnecessary text. This Pr updates the class of pavucontrol to its correct counterpart as shown in screenshot

Without the update pavucontrol was not in floating mode

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• Also include relevant motivation and context (if applicable).
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Type of change

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• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Documentation update (non-breaking change; modified files are limited to the documentations)
• [ ] Technical debt (a code change that does not fix a bug or add a feature but makes something clearer for devs)
• [ ] Other (provide details below)

Checklist

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• [x] I have read the CONTRIBUTING document.
• [x] My code follows the code style of this project.
• [x] My commit message follows the commit guidelines.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added a changelog entry.
• [ ] I have added necessary comments/documentation to my code.
• [ ] I have added tests to cover my changes.
• [ ] I have tested my code locally and it works as expected.
• [ ] All new and existing tests passed.

Screenshots

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Additional context

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