fix: set isLoading: false when id is undefined

[TatsuyaYamamoto]

I can't tell if this PR is a fix or a feat.

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If id is undefined, useTweet return isLoading: true. However, I think useTweet should return isLoading: false because SWR cannot without id. For this reason, I propose to change a behavior of useTweet.

If this change is reasonable, a behavior of <Tweet /> may also need to be changed.

https://github.com/vercel/react-tweet/blob/main/packages/react-tweet/src/swr.tsx

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[lfades]

@TatsuyaYamamoto The change looks reasonable to me, finish the change and I'll merge it!

[TatsuyaYamamoto]

@lfades

I'll make changes, but I’m not sure about the new expected behavior of <Tweet/> ..... 🤔
When id is undefined, useTweet return isLoading: false. As a result, <Tweet/> has 2options:

• Return null, because nothing is being loaded.
• Return fallback, because id: undefined is considered a loading state.