Add sanitize to score_genes

[flying-sheep]

• [ ] Closes #
• [ ] Tests included or not required because:
• [ ] Release notes not necessary because:

[codecov[bot]]

Codecov Report

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

Project coverage is 76.97%. Comparing base (d998742) to head (d09d0d1).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3262 +/- ## ========================================== + Coverage 76.96% 76.97% +0.01% ========================================== Files 109 109 Lines 12469 12475 +6 ========================================== + Hits 9597 9603 +6 Misses 2872 2872 ``` | [Flag](https://app.codecov.io/gh/scverse/scanpy/pull/3262/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scverse) | Coverage Δ | | |---|---|---| | [](https://app.codecov.io/gh/scverse/scanpy/pull/3262/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scverse) | `76.97% <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=scverse#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files with missing lines](https://app.codecov.io/gh/scverse/scanpy/pull/3262?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scverse) | Coverage Δ | | |---|---|---| | [src/scanpy/tools/\_score\_genes.py](https://app.codecov.io/gh/scverse/scanpy/pull/3262?src=pr&el=tree&filepath=src%2Fscanpy%2Ftools%2F_score_genes.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=scverse#diff-c3JjL3NjYW5weS90b29scy9fc2NvcmVfZ2VuZXMucHk=) | `86.91% <100.00%> (+0.77%)` | :arrow_up: |