extractors/bilibili: Adapt the new playlist structure

[iawia002]

No description provided.

[codecov]

Codecov Report

Merging #8 into master will decrease coverage by 2.47%.
The diff coverage is 62.96%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   80.93%   78.45%   -2.48%     
==========================================
  Files          11       11              
  Lines         472      506      +34     
==========================================
+ Hits          382      397      +15     
- Misses         80       95      +15     
- Partials       10       14       +4

Impacted Files	Coverage Δ
extractors/bilibili.go	72.51% <62.96%> (-9.96%)	⬇️

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