Rearrange observer type definitions to allow wrapping custom HOC

[mbest]

This PR moves the observer definition for plain functional components before the definition for forwardRef component. Without this change, the code below will generate a TypeScript error

    const TestComponent: React.FC<IProps> = observer(
        validateChildrenWrapper(function TestComponent({ value }) {
            return <div>{value}</div>
        })
    )

Error: Property 'value' does not exist on type '{}'

Before:

After:

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Latest commit: ca86c59

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[mweststrate]

Nice catch, thanks!