feat: opaque windows in gamemode

[noahfraiture]

Pull Request

Description

This make all windows opaque in gamemode. Since the blur is disabled but not the opacity, most of the windows, especially terminals, become unreadable. This will also improve power consumption

Please read these instructions and remove unnecessary text.

Type of change

Please put an x in the boxes that apply:

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] 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

Please put an x in the boxes that apply:

• [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.
• [x] I have added necessary comments/documentation to my code.
• [x] I have tested my code locally and it works as expected.