Fix musiclist duplication

[Salanto]

• Someone should test this on linux.

[codecov-commenter]

Codecov Report

Merging #314 (ad44a45) into master (ca84b54) will increase coverage by 0.04%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
+ Coverage   10.25%   10.29%   +0.04%     
==========================================
  Files          56       56              
  Lines        4672     4673       +1     
==========================================
+ Hits          479      481       +2     
+ Misses       4193     4192       -1     

Impacted Files	Coverage Δ
core/src/server.cpp	0.00% <ø> (ø)
core/src/config_manager.cpp	37.75% <100.00%> (+0.36%)	:arrow_up:

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[mposs00]

pls add tests