Fix video feed on firefox

[mjamescompton]

Summary

On firefox the video feed would fail to load on QR component

Changes

• When videoTracks[0].getSettings() fails on firefox get the first camera deviceId from navigator.mediaDevices.enumerateDevices()

Testing

Steps

Open QR scanner on either add device or add gateway views using the latest firefox browser

Results

Checklist

• Scope: The referenced issue is addressed, there are no unrelated changes.
• Compatibility: The changes are backwards compatible with existing API, storage, configuration and CLI, according to the compatibility commitments in README.md for the chosen target branch.
• Documentation: Relevant documentation is added or updated.
• Testing: The steps/process to test this feature are clearly explained including testing for regressions.
• Infrastructure: If infrastructural changes (e.g., new RPC, configuration) are needed, a separate issue is created in the infrastructural repositories.
• Changelog: Significant features, behavior changes, deprecations and fixes are added to CHANGELOG.md.
• Commits: Commit messages follow guidelines in CONTRIBUTING.md, there are no fixup commits left.

[ryaplots]

Please, open a PR with this also in ENT