Improve CWallet API with new GetAccountPubkey function.

Remove one more caller that is passing CWalletDB.

src/wallet/wallet.h

@@ -662,6 +662,7 @@ public:
      */
     int64_t IncOrderPosNext(CWalletDB *pwalletdb = NULL);
     bool AccountMove(std::string strFrom, std::string strTo, CAmount nAmount, std::string strComment = "");
+    bool GetAccountPubkey(CPubKey &pubKey, std::string strAccount, bool bForceNew = false);
 
     void MarkDirty();
     bool AddToWallet(const CWalletTx& wtxIn, bool fFromLoadWallet, CWalletDB* pwalletdb);