Fix geocoder: true

[hpinkos]

Fixes #6826

[cesium-concierge]

Thanks for the pull request @hpinkos!

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[mramato]

Do all of the other widgets already handle this case?

[hpinkos]

@mramato yes, geocoder was the only one we were overloading this option for

[mramato]

Thanks @hpinkos!