Restore consensus calling for pairs with only one mapped read.

[codecov[bot]]

Codecov Report

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

Comparison is base (6fa1fde) 95.61% compared to head (a5a41b6) 95.61%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #948 +/- ## ======================================= Coverage 95.61% 95.61% ======================================= Files 126 126 Lines 7321 7321 Branches 504 504 ======================================= Hits 7000 7000 Misses 321 321 ``` | [Flag](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/948/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/948/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics) | `95.61% <100.00%> (ø)` | | 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=fulcrumgenomics#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/948?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics) | Coverage Δ | | |---|---|---| | [...fulcrumgenomics/umi/ConsensusCallingIterator.scala](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/948?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics#diff-c3JjL21haW4vc2NhbGEvY29tL2Z1bGNydW1nZW5vbWljcy91bWkvQ29uc2Vuc3VzQ2FsbGluZ0l0ZXJhdG9yLnNjYWxh) | `100.00% <100.00%> (ø)` | |

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