fix(test): restore store_wallet calls lost in merge

[Copilot]

Commit 0710295 added db.store_wallet() before register_test_address() in two unit tests to satisfy the wallet_addresses → wallet(seed_hash) foreign key constraint. A subsequent merge from v1.0-dev (7e95598) overwrote those changes, silently dropping the fix.

• Restored db.store_wallet(&wallet, &Network::Testnet) in test_remove_utxos_removes_from_wallet and test_remove_utxos_cleans_empty_address_entries before the register_test_address call

let db = create_test_database().expect("test db");
db.store_wallet(&wallet, &Network::Testnet)
    .expect("store test wallet");  // ← was lost in merge
register_test_address(&db, &wallet, &addr);

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