FIX: `ratio` arg in volume pairwise comparison

[AntoineTheb]

Quick description

A bug in a function call inverted the behavior of the --ignore_zeros_in_BA and --ratio parameters in scil_volume_pairwise_comparison.py

Type of change

Check the relevant options.

• [X] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Provide data, screenshots, command line to test (if relevant)

Checklist

• [X] My code follows the style guidelines of this project (run autopep8)
• [ ] I added relevant citations to scripts, modules and functions docstrings and descriptions
• [X] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [ ] I moved all functions from the script file (except the argparser and main) to scilpy modules
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] New and existing unit tests pass locally with my changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 68.93%. Comparing base (48d606d) to head (a75ee6a). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1051 +/- ## ======================================= Coverage 68.92% 68.93% ======================================= Files 438 438 Lines 22889 22889 Branches 3106 3106 ======================================= + Hits 15777 15779 +2 + Misses 5794 5793 -1 + Partials 1318 1317 -1 ``` | [Components](https://app.codecov.io/gh/scilus/scilpy/pull/1051/components?src=pr&el=components&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | Coverage Δ | | |---|---|---| | [Scripts](https://app.codecov.io/gh/scilus/scilpy/pull/1051/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | `69.84% <ø> (+0.01%)` | :arrow_up: | | [Library](https://app.codecov.io/gh/scilus/scilpy/pull/1051/components?src=pr&el=component&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scilus) | `67.65% <ø> (ø)` | |