test(event_manager): Fix incorrect invocations of manager.save

[mitsuhiko]

These tests pass the hardcoded project id of 1. For some reason the actual project it is now 2. Instead of hardcoding this now passes the project id explicitly.

[github-actions[bot]]

This pull request has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

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"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀

[mitsuhiko]

This needs a review.