Update rtk-query redux-persist Example

[sambolias]

Found that when rehydration is set up per the existing docs there is a runtime error when trying to load first time, or after clearing storage. Optionally accessing reducer path seems to work well, and was published on stack overflow https://stackoverflow.com/a/72959139. Updating these docs should save others the trouble I had.

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[kasparkallas]

Trying out redux-persist, the store seems to rehydrate without specifing any extractRehydrationInfo logic. Do you know if there's any difference whether I call it or not?

[phryneas]

The job of extractRehydrationInfo here is to remove data that is otherwise restored "too much", so yes, you need it.