fix(core): emit local settings value immediately upon subscription

[bjoerge]

Description

Fixes an oversight in #7554. This reads and emits the current local settings value upon subscription (syncronously), which was the intention with #7554, but I forgot to actually read it initially 🙈

What to review

I also removed the (currently disabled) sync between tabs. We can revisit this in the future, but if we want this it should probably be on a "per-setting" basis (for future reference, I've made a quick POC for that in the keyval-support-cross-tab-sync-branch)

Notes for release

n/a internal

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
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1 Skipped Deployment

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studio-workshop	⬜️ Ignored (Inspect)			Sep 30, 2024 9:17am

[github-actions]

No changes to documentation

[github-actions]

Component Testing Report Updated Sep 30, 2024 9:24 AM (UTC)

✅ All Tests Passed -- expand for details

File	Status	Duration	Passed	Skipped	Failed
comments/CommentInput.spec.tsx	✅ Passed (Inspect)	45s	15	0	0
formBuilder/ArrayInput.spec.tsx	✅ Passed (Inspect)	9s	3	0	0
formBuilder/inputs/PortableText/Annotations.spec.tsx	✅ Passed (Inspect)	32s	6	0	0
formBuilder/inputs/PortableText/copyPaste/CopyPaste.spec.tsx	✅ Passed (Inspect)	37s	11	7	0
formBuilder/inputs/PortableText/copyPaste/CopyPasteFields.spec.tsx	✅ Passed (Inspect)	0s	0	12	0
formBuilder/inputs/PortableText/Decorators.spec.tsx	✅ Passed (Inspect)	18s	6	0	0
formBuilder/inputs/PortableText/DisableFocusAndUnset.spec.tsx	✅ Passed (Inspect)	11s	3	0	0
formBuilder/inputs/PortableText/DragAndDrop.spec.tsx	✅ Passed (Inspect)	3m 0s	0	0	0
formBuilder/inputs/PortableText/FocusTracking.spec.tsx	✅ Passed (Inspect)	46s	15	0	0
formBuilder/inputs/PortableText/Input.spec.tsx	✅ Passed (Inspect)	1m 48s	21	0	0
formBuilder/inputs/PortableText/ObjectBlock.spec.tsx	✅ Passed (Inspect)	1m 18s	18	0	0
formBuilder/inputs/PortableText/PresenceCursors.spec.tsx	✅ Passed (Inspect)	9s	3	9	0
formBuilder/inputs/PortableText/RangeDecoration.spec.tsx	✅ Passed (Inspect)	27s	9	0	0
formBuilder/inputs/PortableText/Styles.spec.tsx	✅ Passed (Inspect)	18s	6	0	0
formBuilder/inputs/PortableText/Toolbar.spec.tsx	✅ Passed (Inspect)	37s	12	0	0
formBuilder/tree-editing/TreeEditing.spec.tsx	✅ Passed (Inspect)	0s	0	3	0
formBuilder/tree-editing/TreeEditingNestedObjects.spec.tsx	✅ Passed (Inspect)	0s	0	3	0