Rounding error and new cache path

[isaac-tfn]

Fixed small error in rounding, and added a default cache path parameters

Describe Changes

Task Checklist

• [ ] Have unittests been added (testing individual functions and their edge cases)
• [ ] Have integration tests been added (if applicable, to test modules of functionality)
• [ ] Updated RELEASE.md to reflect changes in PR
• [ ] Have new dependencies been added?
  • [ ] Have they been added to either requirements.txt or requirements_dev.txt.
  • [ ] Have they been added to setup.cfg

[codecov[bot]]

Codecov Report

Patch coverage: 75.00% and no project coverage change

Comparison is base (fe33683) 84.79% compared to head (df70eee) 84.79%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2 +/- ## ======================================= Coverage 84.79% 84.79% ======================================= Files 6 6 Lines 296 296 ======================================= Hits 251 251 Misses 45 45 ``` | [Impacted Files](https://codecov.io/gh/Transport-for-the-North/caf.space/pull/2?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Transport-for-the-North) | Coverage Δ | | |---|---|---| | [src/caf/space/zone\_translation.py](https://codecov.io/gh/Transport-for-the-North/caf.space/pull/2?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Transport-for-the-North#diff-c3JjL2NhZi9zcGFjZS96b25lX3RyYW5zbGF0aW9uLnB5) | `88.88% <ø> (ø)` | | | [src/caf/space/zone\_correspondence.py](https://codecov.io/gh/Transport-for-the-North/caf.space/pull/2?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Transport-for-the-North#diff-c3JjL2NhZi9zcGFjZS96b25lX2NvcnJlc3BvbmRlbmNlLnB5) | `95.23% <50.00%> (ø)` | | | [src/caf/space/inputs.py](https://codecov.io/gh/Transport-for-the-North/caf.space/pull/2?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Transport-for-the-North#diff-c3JjL2NhZi9zcGFjZS9pbnB1dHMucHk=) | `81.25% <100.00%> (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=Transport-for-the-North). 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=Transport-for-the-North)

:umbrella: View full report at Codecov.
:loudspeaker: Do you have feedback about the report comment? Let us know in this issue.