Replace calls to GetHash() with GetTxid() for transaction objects.

Where the caller intends to receive a transaction id and not a double
SHA256 hash.

src/init.cpp

@@ -1384,7 +1384,7 @@ bool AppInit2(boost::thread_group& threadGroup, CScheduler& scheduler)
 
                 BOOST_FOREACH(const CWalletTx& wtxOld, vWtx)
                 {
-                    uint256 hash = wtxOld.GetHash();
+                    uint256 hash = wtxOld.GetTxid();
                     std::map<uint256, CWalletTx>::iterator mi = pwalletMain->mapWallet.find(hash);
                     if (mi != pwalletMain->mapWallet.end())
                     {