Fix main playlist selection to respect the order of provided playlist IDs

[dan-niles]

Close #286

Changes:

• Replace list(set(playlist_ids)) to dict.fromkeys(playlist_ids) to maintain the order of the given playlist IDs.

[codecov[bot]]

Codecov Report

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

Project coverage is 1.51%. Comparing base (594680e) to head (e1c24be). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #296 +/- ## ===================================== Coverage 1.51% 1.51% ===================================== Files 11 11 Lines 1125 1125 Branches 166 166 ===================================== Hits 17 17 Misses 1108 1108 ```

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