fix(firestore,windows): honor persistenceEnabled: false

[SelaseKay]

Description

On Windows, Settings(persistenceEnabled: false) never reached the C++ Firestore client.

GetFirestoreFromPigeon assigns pigeonApp.settings().persistence_enabled() (a const bool*) to a bool, so the assignment tests pointer presence rather than the value — an explicit false is read as true. The plugin also never calls settings.set_persistence_enabled(...), and the C++ SDK defaults persistence to on, so even a correct dereference would not disable it.

This dereferences the pointer and forwards the value. A Windows-only e2e writes a doc, terminates the client, then get(source: cache): disk cache is the only state that survives terminate. A persistence-on control must hit cache; the disabled instance must miss.

Related Issues

• Fixes [cloud_firestore]: Windows ignores persistenceEnabled: false #18659

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