Fix issue with media permissions on Linux

[j0794]

Summary

Fixes persistence of microphone and camera access on Linux by checking the platform before calling systemPreferences.getMediaAccessStatus, which is only implemented on Windows and macOS (https://www.electronjs.org/docs/latest/api/system-preferences#systempreferencesgetmediaaccessstatusmediatype-windows-macos)

Checklist

• Added or updated unit tests (required for all new features)
• Has UI changes
• read and understood our Contributing Guidelines
• completed Mattermost Contributor Agreement
• executed npm run lint:js for proper code formatting
• Run E2E tests by adding label Run Desktop E2E Tests

Device Information

This PR was tested on: Ubuntu 22.04

Release Note

NONE

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[devinbinnie]

Thanks for splitting this out @j0794!

[mattermost-build]

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