Correct for offsets in list json serialization

[codecov[bot]]

Codecov Report

Patch coverage: 88.96% and no project coverage change.

Comparison is base (07fd3f6) 83.70% compared to head (0a711a1) 83.71%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1475 +/- ## ======================================= Coverage 83.70% 83.71% ======================================= Files 389 389 Lines 41775 41811 +36 ======================================= + Hits 34969 35002 +33 - Misses 6806 6809 +3 ``` | [Impacted Files](https://codecov.io/gh/jorgecarleitao/arrow2/pull/1475?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao) | Coverage Δ | | |---|---|---| | [src/io/json/write/serialize.rs](https://codecov.io/gh/jorgecarleitao/arrow2/pull/1475?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao#diff-c3JjL2lvL2pzb24vd3JpdGUvc2VyaWFsaXplLnJz) | `91.48% <88.81%> (-0.69%)` | :arrow_down: | | [src/io/json/write/mod.rs](https://codecov.io/gh/jorgecarleitao/arrow2/pull/1475?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao#diff-c3JjL2lvL2pzb24vd3JpdGUvbW9kLnJz) | `98.59% <100.00%> (ø)` | | | [src/io/ndjson/write/mod.rs](https://codecov.io/gh/jorgecarleitao/arrow2/pull/1475?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao#diff-c3JjL2lvL25kanNvbi93cml0ZS9tb2QucnM=) | `97.29% <100.00%> (ø)` | | ... and [2 files with indirect coverage changes](https://codecov.io/gh/jorgecarleitao/arrow2/pull/1475/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Jorge+Leitao)

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