Fix for "Your first feature" tutorial Store type mismatch in #Preview

[jrhey]

The tutorial uses Store(...) to initialize the CounterFeature store, which leads to a type mismatch error in the latest versions of TCA.

This commit updates the tutorial code to use the explicit generic form StoreOf<CounterFeature>(...)

[mbrandonw]

Hi @jrhey, are you sure you don't have another type in your project named Store? Or perhaps something else is off in your project, because the stated way in the tutorial is the way to initialize a store. You can see we have hundreds of examples of this throughout the repo that compile just fine:

https://github.com/search?q=repo%3Apointfreeco%2Fswift-composable-architecture+%22Store%28initialState%22&type=code

If you can share a repro of this problem we will take a closer look.

[jrhey]

@mbrandonw ah my mistake! You're right, I did have a StoreKit Store in this project already. I'll close this PR 👍