fix: save versioned segment overrides

[kyle-ssg]

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• I have added information to docs/ if required so people know about the feature!
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Changes

Combining segment and value change requests in a single request brought up a bug in saving segment overrides where applied logic as if it was attempting to schedule them - this is because button presses send a truthy value by default.

              const saveFeatureSegments = saveFeatureWithValidation(
                (schedule) => {...}

How did you test this code?

Removed / added / adjusted segment overrides on a versioned environment

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4892	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4892	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4892	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4892	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4892	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4892	Finished ✅	Results ✅

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