Avoid loading balena-settings-client in browsers using the browser field

[thgreasi]

Change-type: minor See: https://github.com/balena-io/balena-sdk/issues/254

Resolves: # HQ: See: Depends-on: Change-type: major|minor|patch

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Contributor checklist

• [ ] Includes tests
• [ ] Includes typings
• [ ] Includes updated documentation
• [ ] Includes updated build output

[thgreasi]

I self-certify!