add setDirty() logic to remove actions on mediaPicker3 property editor

[Bakersbakebread]

Addresses issue #13009

Fixes #13009

the setDirty() logic was missing from remove-able actions, this PR adds them

[github-actions]

Hi there @Bakersbakebread, thank you for this contribution! 👍

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[nul800sebastiaan]

Excellent @Bakersbakebread - does what it says on the tin! 👍 Thanks for the help!

[nul800sebastiaan]

Ps. FYI Leaving Fixes #1234 from the PR template in place helps to auto-link issues and PRs, so I wouldn't have to manually close the related issues. I've added that now to make the link happen.

[nul800sebastiaan]

Cherry picked for 10.4.0 ded4424