fix: add fees in TT price calculation

[mustermeiszer]

Description

See issue

Fixes #1989

Changes and Descriptions

• just adds fees to tranche token price calculation

Checklist:

• [x] I have added Rust doc comments to structs, enums, traits and functions
• [x] I have made corresponding changes to the documentation
• [x] I have performed a self-review of my code
• [x] I have added tests that prove my fix is effective or that my feature works

[codecov[bot]]

Codecov Report

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

Project coverage is 48.22%. Comparing base (7af4729) to head (49cce6b). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1990 +/- ## ========================================== + Coverage 48.19% 48.22% +0.02% ========================================== Files 183 183 Lines 13403 13406 +3 ========================================== + Hits 6460 6465 +5 + Misses 6943 6941 -2 ```

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[mustermeiszer]

Why did the pipeline fcancel.