Correct ActionLog websocket tournament check

[tienne-B]

No description provided.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: tabbycat/actionlog/mixins.py

Function	Unhandled Issue
log_action	AttributeError: 'TournamentViewSet' object has no attribute 'tournament' ... Event Count: 2

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