Fix complement of W and S iupac codes.

[codecov-commenter]

Codecov Report

Patch coverage: 50.00% and no project coverage change.

Comparison is base (ad6e200) 95.65% compared to head (b81c1ed) 95.65%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #912 +/- ## ======================================= Coverage 95.65% 95.65% ======================================= Files 126 126 Lines 7296 7296 Branches 480 480 ======================================= Hits 6979 6979 Misses 317 317 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `95.65% <50.00%> (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. | [Impacted Files](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/912?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics) | Coverage Δ | | |---|---|---| | [...ain/scala/com/fulcrumgenomics/util/Sequences.scala](https://app.codecov.io/gh/fulcrumgenomics/fgbio/pull/912?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=fulcrumgenomics#diff-c3JjL21haW4vc2NhbGEvY29tL2Z1bGNydW1nZW5vbWljcy91dGlsL1NlcXVlbmNlcy5zY2FsYQ==) | `86.13% <50.00%> (ø)` | |

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