tests: Move ADDRESS_BCRT1_UNSPENDABLE to wallet/test/util.h

This static address is usable for other wallet tests and benchmarks, so
make it available to them.

src/bench/wallet_balance.cpp

@@ -14,8 +14,6 @@
 
 #include <optional>
 
-const std::string ADDRESS_BCRT1_UNSPENDABLE = "bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj";
-
 namespace wallet {
 static void WalletBalance(benchmark::Bench& bench, const bool set_dirty, const bool add_mine)
 {

src/wallet/test/util.h

@@ -32,6 +32,8 @@ static const DatabaseFormat DATABASE_FORMATS[] = {
 #endif
 };
 
+const std::string ADDRESS_BCRT1_UNSPENDABLE = "bcrt1qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqq3xueyj";
+
 std::unique_ptr<CWallet> CreateSyncedWallet(interfaces::Chain& chain, CChain& cchain, const CKey& key);
 
 std::shared_ptr<CWallet> TestLoadWallet(WalletContext& context);