When creating a new check list, set the `checked` value of the list item to `false` instead of `undefined`

[amanharwara]

At the moment, when creating a new checklist, the newly created list item doesn't have the checked set until the user manually toggles it. This PR makes sure that the checked value is set to false and not undefined. This also makes the behavior in line with the behavior when creating a check list using the markdown transformer.

https://github.com/facebook/lexical/assets/8348101/a065966a-ceae-4ce4-bf11-250a041efd0f

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2024 8:54am
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[potatowagon]

packages/lexical-playground/tests/e2e/List.spec.mjs:1170:3 › Nested List › Can create check list, toggle it to bullet-list and back

is breaking

[github-actions[bot]]

size-limit report 📦

Path	Size
lexical - cjs	28.33 KB (0%)
lexical - esm	28.14 KB (0%)
@lexical/rich-text - cjs	36.77 KB (0%)
@lexical/rich-text - esm	28.1 KB (0%)
@lexical/plain-text - cjs	35.35 KB (0%)
@lexical/plain-text - esm	25.33 KB (0%)
@lexical/react - cjs	38.51 KB (0%)
@lexical/react - esm	29.12 KB (0%)

[amanharwara]

Sorry for the long delay. Should be fixed now.