Fix deleting sublinks

[Reettaphant]

What's changed?

Detail the main feature of this PR and optionally a link to the relevant issue / card

I broke deleting sublinks, I fixed deleting sublinks. We can't select a group if we are deleting a sublinks and we need to handle this case correctly.

Implementation notes

Include any specific areas you want to highlight for review that you feel might be worthy of discussion (i.e. any non-obvious decisions you've made)

Checklist

General

• 🤖 Relevant tests added
• ✅ CI checks / tests run locally
• 🔍 Checked on CODE

Client

• 🚫 No obvious console errors on the client (i.e. React dev mode errors)
• 🎛️ No regressions with existing user interactions (i.e. all existing buttons, inputs etc. work)
• 📷 Screenshots / GIFs of relevant UI changes included

[jonathonherbert]

Oh no, good to see a fix! Is it possible to test this behaviour via either unit/integration? We've introduced a few regressions recently and it'd be good to catch them next time.

[Reettaphant]

I think for finding these kinds fo bugs integration tests testing removing, adding and moving articles from different positions would be very useful for catching these kinds of issues and we should do them before news desk rollout so that we stop breaking move beahviour. I think it's out of scope for this pr though.

[RichieAHB]

I think we should get this out, but I do think this probably needs a test given the amount of logic here.