Change `hidden` prop value to hide GUI from false to true in docs

[david98]

The configuration docs say that explicitly setting the hidden prop to false will hide the GUI, but I believe this to be an oversight. Setting it to true actually hides Leva.

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Name	Status	Preview	Comments	Updated (UTC)
leva	❌ Failed (Inspect)			Jun 10, 2025 8:18am

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Latest deployment of this branch, based on commit ece24583a0f2aec84b3a9e5b445b48f0a9737a2b:

Sandbox	Source
leva-minimal	Configuration
leva-busy	Configuration
leva-scroll	Configuration
leva-advanced-panels	Configuration
leva-ui	Configuration
leva-theme	Configuration
leva-transient	Configuration
leva-plugin-plot	Configuration
leva-plugin-bezier	Configuration
leva-plugin-spring	Configuration
leva-plugin-dates	Configuration
leva-custom-plugin	Configuration