Fix WASM demo app to use mj_loadXML instead of deprecated loadFromXML #2988
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The demo app was using the old loadFromXML API which was renamed to mj_loadXML in commit 49394d5 (Nov 19, 2025) as part of a broader effort to align WASM bindings with native C API naming conventions.
This change updates the demo to use the current API, fixing the error:
TypeError: mujoco.MjModel.loadFromXML is not a functionFixes #2960