Fix failing test with `bench` feature
Using the `bench` feature, `cargo test` was failing since one of the benchmarks was running into a debug assertion for attempting to access a line with an index beyond the grid length. Since this issue was caused by the `len` property not being serialized and deserialized, the `#[serde(skip)]` attribute has been changed to `#[serde(default)]`. The ref-test has been edited to include the correct grid length for proper deserialization. This fixes #1604.
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