Projectile ref clears

[Doubleumc]

About the pull request

Forgot to clear a reference I set in #4986 and cleared some others I saw.

Not familiar enough with the Destroy/QDEL pipeline to know what else, if anything, should be done with weapon_cause_data and bullet_traits since they hold references themselves.

Explain why it's good for the game

I will clean up after myself.

Testing Photographs and Procedure

Screenshots & Videos

Put screenshots and videos here with an empty line between the screenshots and the <details> tags.

Changelog

No player-facing changes.

[fira]

weapon_cause_data can be discarded without qdel
i'm not really seeing where bullet_traits have refs, do you have a specific location in mind?

[Doubleumc]

weapon_cause_data can be discarded without qdel i'm not really seeing where bullet_traits have refs, do you have a specific location in mind?

My understanding was bullet_traits were components, which do a lot of things but at the very least contained a parent ref to the holding projectile. Not familiar enough to know if that is handled gracefully - probably fine as-is since its been working without this change for a long time.

[github-actions]

This PR has been inactive for long enough to be automatically marked as stale. This means it is at risk of being auto closed in ~ 7 days, please address any outstanding review items and ensure your PR is finished, if these are all true and you are auto-staled anyway, you need to actively ask maintainers if your PR will be merged. Once you have done any of the previous actions then you should request a maintainer remove the stale label on your PR, to reset the stale timer. If you feel no maintainer will respond in that time, you may wish to close this PR youself, while you seek maintainer comment, as you will then be able to reopen the PR yourself