fix: [BIM Tiles] Error when removing streamed model from scene

[Rocha442]

Description

After streaming an IFC model into the scene, if we call remove(modelID) from the FragmentStreamLoader, an error will be thrown by the loader's GeometryCullerRenderer remove(modelID), because while the _geometry property has been cleared, the _foundGeometry property will still have some of the model's geometry. The error is thrown the next time the culler is updated.

Additional context

This PR is trying to fix [issue:#345]
There is probably a more thorough approach to fix this issue, but for my use case this worked as intended. I just wanted to at least give attention to this issue.

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What is the purpose of this pull request?

• Bug fix

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