fix(types): Don't double UnwrapRef in setup stores

[bgoscinski]

fixes #2770

Without this change for setup stores UnwrapRef is applied to state type twice.

First time after defineStore infers the SS type parameter and passes it to _ExtractStateFromSetupStore:

pinia/packages/pinia/src/types.ts

Line 586 in 3c8782e

? _UnwrapAll<Pick<SS, _ExtractStateFromSetupStore_Keys<SS>>>

Then the result of _ExtractStateFromSetupStore<SS> is passed to StoreDefinition interface, which passes it to Store type, which does

pinia/packages/pinia/src/types.ts

Line 470 in 3c8782e

UnwrapRef<S> &

First unwrap call reduces state type

// from
{ foo: ShallowRef<{ bar: Ref<string> }> }
// to 
{ foo: { bar: Ref<string> } }

Second unwrap call reduces it further producing type that doesn't match the runtime value

// from
{ foo: { bar: Ref<string> } }
// to the incorrect
{ foo: { bar: string } }

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[bgoscinski]

This was passing even without my change because types are correctly set when using option stores

[bgoscinski]

my change causes that these 2 assertions pass as well

[bgoscinski]

@posva this is ready for review :)