fix: Duplicated segment conditions on save

[kyle-ssg]

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Changes

Updates segments when they are saved, fixing an issue whereby rules were duplicated after multiple saves.

How did you test this code?

• Create a segment and save it then save it again
• Update an already created segment then save it again

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 11:18am
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 11:18am
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 15, 2024 11:18am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4726	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4726	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4726	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4726	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4726	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4726	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-57205 was deleted.

[rolodato]

LGTM, but noting this will make #3600 a lot more evident since it happens immediately on saving without needing to refresh.