fix: Relativize paths in examples/**/*.map.json

[davewa]

Closes:

• Collision demo does not work on macOS #43

Manually changed the *.map.json files, replacing absolute file paths with assets-path-relative paths to the same files. Also changed all \\ to / in paths.

Testing

Passes all PR checks:

cargo fmt --all
cargo clippy --workspace -- -D warnings
cargo test --workspace

cargo run --example collision_demo works correctly on macOS 26.3.1 (Apple M2), and Windows 11 (aarch64).

Notes

This only edits the *.map.json files in the examples/ folder, there are no code changes. Creating a new project using the editor still writes absolute paths into the .map.json file for the project. I'd prefer to address that in a separate PR, possibly using diff_paths to handle creating relative paths to files outside of the assets folder.