Fix leaderboard/tournament hooks sometimes not firing.

[sesposito]

Remove some potential race conditions that could cause reset/end hooks not to fire.

Resolves #2429

[Copilot]

Pull request overview

Fixes an intermittent race in LocalLeaderboardScheduler where tournament end/reset hooks can be skipped when end-active and expiry land on the same Unix second.

Changes:

• Add scheduledEndActive / scheduledExpiry tracking to avoid cancelling the “other” timer when both target the same second.
• Simplify timer stopping behavior in Pause()/Stop().
• Add an (currently skipped) auxiliary test and update the changelog entry.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 6 comments.

File	Description
server/leaderboard_scheduler.go	Avoids stopping/replacing timers when rescheduling to the same Unix second.
server/leaderboard_scheduler_test.go	Adds an auxiliary (skipped) test intended to reproduce the race condition.
CHANGELOG.md	Adds a release note about the fix.
data/modules/tournament.lua	Adds a trailing newline.

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