fix: requestId init tag

[adrums86]

Description

When handling a encrypted init segment -init was being added to the requestId erroneously.

Specific Changes proposed

• Remove the -init addition, as it is added to the id below when the request is made without changing the actual requestId itself.
• Add a test to ensure requestId is unchanged when decrypting an init segment.

Requirements Checklist

• [x] Feature implemented / Bug fixed
• [x] If necessary, more likely in a feature request than a bug fix
  • [x] Unit Tests updated or fixed
  • [ ] Docs/guides updated
  • [ ] Example created (starter template on JSBin)
• [ ] Reviewed by Two Core Contributors

[codecov[bot]]

Codecov Report

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

Project coverage is 86.31%. Comparing base (5f2af5f) to head (12e3c21).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1518 +/- ## ========================================== - Coverage 86.31% 86.31% -0.01% ========================================== Files 43 43 Lines 11098 11097 -1 Branches 2532 2532 ========================================== - Hits 9579 9578 -1 Misses 1519 1519 ```

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