misc: use impl instead of type generic

[vnghia]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.06173% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.55%. Comparing base (e2d8b01) to head (e80948a).
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/open_subsonic/common/params.rs	77.77%	0 Missing and 2 partials ⚠️
src/open_subsonic/media_retrieval/get_cover_art.rs	66.66%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
- Coverage   80.58%   80.55%   -0.04%     
==========================================
  Files         213      213              
  Lines       12230    12224       -6     
  Branches    12230    12224       -6     
==========================================
- Hits         9856     9847       -9     
- Misses       1732     1734       +2     
- Partials      642      643       +1     

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