11343: Remove blocklist block on cancel

[patrickdemooij9]

If there's an existing issue for this PR then this fixes #11343

It seems like the logic for this was already in place, but not fully connected yet. Now, I don't know if the way that I did this is the best way. Another idea was to pass the arguments through the edit function, but I don't know if that messes up anything for package developers that are using that function. Let me know if this solution is good enough or if another way is preferred!

[umbrabot]

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[jannikanker]

Should also fix #11218 .

[nathanwoulfe]

Hey @patrickdemooij9 I'm not really across the BlockList API, but this looks good to me - works as described.