fix : remove duplicate stalemate method definition in Pygame-Chess board.py

[tmdeveloper007]

Summary of What Needs to be Done

Remove the duplicate stalemate() method definition in games/Pygame-Chess/board.py. The file defines stalemate() twice on lines 50-51 and 52-53. Python will use the second definition (the same behavior both times), but this is a maintenance issue and will cause linters/pyright to flag duplicate method names.

Changes that Need to be Made

Remove the second (duplicate) stalemate() method definition, keeping only the first one which correctly calls self.board.is_stalemate().

Impact that it would Provide

Cleaner code, no duplicate method definitions, no linter warnings for duplicate names.

Note: please assign this issue to the tmdeveloper007 account.

[github-actions]

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