Update generate_playlist.py

[chuzaiza]

Types of changes

• Bugfix
• New feature
• Refactoring
• Breaking change (any change that would cause existing functionality to not work as expected)
• Documentation Update
• Other (please describe)

Description

Checklist:

• Add test cases to all the changes you introduce
• Run inv style locally to ensure all linter checks pass
• Run inv test locally to ensure all test cases pass
• Run inv secure locally to ensure no major vulnerability is introduced
• Update the documentation if necessary

Steps to Test This Pull Request

Expected behavior

Related Issue

Additional context

[chuzaiza]

解決如果Playlist Video numbers > 50 後面就取不出來的問題