scripted-diff: Use DataStream in most places

The remaining places are handled easier outside a scripted-diff.

-BEGIN VERIFY SCRIPT-
 sed --regexp-extended -i 's/CDataStream ([0-9a-zA-Z_]+)\(SER_[A-Z]+, [A-Z_]+_VERSION\);/DataStream \1{};/g' $( git grep -l CDataStream)
 sed -i 's/, CDataStream/, DataStream/g' src/wallet/walletdb.cpp
-END VERIFY SCRIPT-

src/qt/walletmodel.cpp

@@ -543,7 +543,7 @@ bool WalletModel::bumpFee(uint256 hash, uint256& new_hash)
             return false;
         }
         // Serialize the PSBT
-        CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+        DataStream ssTx{};
         ssTx << psbtx;
         GUIUtil::setClipboard(EncodeBase64(ssTx.str()).c_str());
         Q_EMIT message(tr("PSBT copied"), tr("Copied to clipboard", "Fee-bump PSBT saved"), CClientUIInterface::MSG_INFORMATION);