Fix proportions test

[codecov[bot]]

Codecov Report

Base: 95.05% // Head: 95.05% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (48126ea) compared to base (1adb392). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #702 +/- ## ======================================= Coverage 95.05% 95.05% ======================================= Files 153 153 Lines 4062 4063 +1 Branches 206 206 ======================================= + Hits 3861 3862 +1 Misses 131 131 Partials 70 70 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `94.95% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openproblems-bio#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/openproblems-bio/openproblems/pull/702?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openproblems-bio) | Coverage Δ | | |---|---|---| | [openproblems/tasks/spatial\_decomposition/api.py](https://codecov.io/gh/openproblems-bio/openproblems/pull/702/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openproblems-bio#diff-b3BlbnByb2JsZW1zL3Rhc2tzL3NwYXRpYWxfZGVjb21wb3NpdGlvbi9hcGkucHk=) | `100.00% <100.00%> (ø)` | | | [...sks/spatial\_decomposition/methods/cell2location.py](https://codecov.io/gh/openproblems-bio/openproblems/pull/702/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=openproblems-bio#diff-b3BlbnByb2JsZW1zL3Rhc2tzL3NwYXRpYWxfZGVjb21wb3NpdGlvbi9tZXRob2RzL2NlbGwybG9jYXRpb24ucHk=) | `96.61% <100.00%> (+0.05%)` | :arrow_up: | 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=openproblems-bio). 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=openproblems-bio)

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[scottgigante-immunai]

Tess passing at https://tower.nf/orgs/openproblems-bio/workspaces/openproblems-bio/watch/Hvk8fTaLQi1yv