perf: remove duplicate adapter fragments

Description

Removed the remaining adapters (GATCGGAAGAGCACA, TCGTATGCCGTCTTC, CCGACAGGTTCAGAG and ACAGGTTCAGAGTTC) from data/adapter_fragments.txt to increase frequency ratio between first and second most common adapters.

Fixes #121

Type of change

[X] Bug fix (non-breaking change which fixes an issue)

Checklist

Please carefully read these items and tick them off if the statements are true or do not apply.

[X] I have performed a self-review of my own code
[X] My code follows the existing coding style, lints and generates no new warnings
[X] I have added type annotations to all function/method signatures, and I have added type annotations for any local variables that are non-trivial, potentially ambiguous or might otherwise benefit from explicit typing.
[X] I have commented my code in hard-to-understand areas
[X] I have added ["Google-style docstrings"] to all new modules, classes, methods/functions or updated previously existing ones
[X] I have added tests that prove my fix is effective or that my feature works
[X] New and existing unit tests pass locally with my changes and I have not reduced the code coverage relative to the previous state
[X] I have updated any sections of the app's documentation that are affected by the proposed changes

If for some reason you are unable to tick off all boxes, please leave a comment explaining the issue you are facing so that we can work on it together.

Codecov Report

Patch and project coverage have no change.

Comparison is base (ba83740) 99.78% compared to head (7c8fe62) 99.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## dev #122 +/- ## ======================================= Coverage 99.78% 99.78% ======================================= Files 12 12 Lines 948 948 ======================================= Hits 946 946 Misses 2 2 ``` 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=zavolanlab). 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=zavolanlab)

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zavolanlab / htsinfer