[FIX] Fix controller models in XR movement example

[willeastcott]

Summary

• Fix missing parentheses on getLocalPosition() and getLocalRotation() method calls that were passing function references instead of calling the methods
• Replace deprecated model component with render component for controller visualization

Details

The example had two issues:

1. Bug fix: inputSource.getLocalPosition and inputSource.getLocalRotation were missing parentheses, causing the controller entities to receive function references instead of Vec3/Quat values. This prevented controller positions from updating correctly.

2. Deprecation cleanup: Replaced the deprecated model component with the render component for the controller box entities.

Checklist

• I have read the contributing guidelines
• My code follows the project's coding standards
• This PR focuses on a single change

[Copilot]

Pull request overview

This PR fixes critical bugs and deprecation issues in the XR VR movement example that prevented controllers from displaying and updating correctly.

Changes:

• Fixed missing parentheses on getLocalPosition() and getLocalRotation() method calls that were causing function references to be passed instead of actual position/rotation values
• Replaced deprecated model component with render component for controller visualization

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