Remove map and createStore from mount.ts

[thetarnav]

I don't know if I'm missing something or is this a leftover, but the weak map is only being written to and the props object doesn't get changed, so it doesn't need to be a store.
I don't like when stores are added to the bundle for no reason.

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Latest commit: 680940d

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commit: 680940d

[ryansolid]

It's because the implementation present here is only half of the implementation. The Store was there when we had islands routing mode which could write to the props.