Fix support for canvas renderer

[salojoo]

Fix support for canvas renderer

Description of change

Figured out that loseContext only exists as an extension for webgl, so no point in trying to set it for canvas.

Fixes: support for canavas renderer

Pre-Merge Checklist

• [ ] Tests and/or benchmarks are included
• [ ] Documentation is changed or added
• [x] Lint process passed (npm run lint)
• [x] Tests passed (npm run test)

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