fix get_playlist continuations

[sigma67]

closes #734

[codecov]

Codecov Report

Attention: Patch coverage is 91.30435% with 2 lines in your changes missing coverage. Please review.

Project coverage is 95.14%. Comparing base (535f153) to head (636822a).
Report is 1 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
ytmusicapi/continuations.py	89.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #736      +/-   ##
==========================================
- Coverage   95.19%   95.14%   -0.05%     
==========================================
  Files          41       41              
  Lines        2392     2410      +18     
==========================================
+ Hits         2277     2293      +16     
- Misses        115      117       +2     

Flag	Coverage Δ
unittests	95.14% <91.30%> (-0.05%)	⬇️

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