Remove the statistics button from contest page

[boomzero]

What does this PR aim to accomplish?:

Remove the statistics button from the contest page

How does this PR accomplish the above?:

idk, too hard for my understanding

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[Copilot]

Pull Request Overview

This PR removes the statistics button from the contest page to simplify the user interface.

• Removed the creation and event listener attachment for the "统计" (statistics) button.
• The modifications focus solely on eliminating the button and its associated functionality.