Fix track IO issue when writing tracks directly

[quantumjot]

Fixes #194

[quantumjot]

@nthndy - does this fix it for you too?

[deprecated-napari-hub-preview-bot[bot]]

Preview page for your plugin is ready here: https://preview.napari-hub.org/quantumjot/BayesianTracker/195 Updated: 2023-01-16T13:03:43.839003

[nthndy]

Yes, this works for me now. Thank you!

[codecov-commenter]

Codecov Report

Base: 86.84% // Head: 86.93% // Increases project coverage by +0.08% :tada:

Coverage data is based on head (82a0c02) compared to base (9f08f1c). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #195 +/- ## ========================================== + Coverage 86.84% 86.93% +0.08% ========================================== Files 13 14 +1 Lines 1513 1523 +10 ========================================== + Hits 1314 1324 +10 Misses 199 199 ``` | [Impacted Files](https://codecov.io/gh/quantumjot/BayesianTracker/pull/195?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe) | Coverage Δ | | |---|---|---| | [btrack/dataio.py](https://codecov.io/gh/quantumjot/BayesianTracker/pull/195?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL2RhdGFpby5weQ==) | `80.67% <100.00%> (ø)` | | | [btrack/\_\_init\_\_.py](https://codecov.io/gh/quantumjot/BayesianTracker/pull/195?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe#diff-YnRyYWNrL19faW5pdF9fLnB5) | `100.00% <0.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Alan+R+Lowe)

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