init: Move berkeleydb version reporting to wallet

Move the version reporting to Wallet::Verify, before starting
verification of the wallet.

This removes the dependency of init on a specific wallet database
library.

A further, trivial step towards resolving #7965.

src/wallet/wallet.cpp

@@ -368,6 +368,7 @@ void CWallet::Flush(bool shutdown)
 
 bool CWallet::Verify()
 {
+    LogPrintf("Using BerkeleyDB version %s\n", DbEnv::version(0, 0, 0));
     std::string walletFile = GetArg("-wallet", DEFAULT_WALLET_DAT);
 
     LogPrintf("Using wallet %s\n", walletFile);