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/psbtoperationsdialog.cpp

@@ -128,14 +128,14 @@ void PSBTOperationsDialog::broadcastTransaction()
 }
 
 void PSBTOperationsDialog::copyToClipboard() {
-    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    DataStream ssTx{};
     ssTx << m_transaction_data;
     GUIUtil::setClipboard(EncodeBase64(ssTx.str()).c_str());
     showStatus(tr("PSBT copied to clipboard."), StatusLevel::INFO);
 }
 
 void PSBTOperationsDialog::saveTransaction() {
-    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    DataStream ssTx{};
     ssTx << m_transaction_data;
 
     QString selected_filter;

src/qt/sendcoinsdialog.cpp

@@ -397,7 +397,7 @@ bool SendCoinsDialog::PrepareSendText(QString& question_string, QString& informa
 void SendCoinsDialog::presentPSBT(PartiallySignedTransaction& psbtx)
 {
     // Serialize the PSBT
-    CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
+    DataStream ssTx{};
     ssTx << psbtx;
     GUIUtil::setClipboard(EncodeBase64(ssTx.str()).c_str());
     QMessageBox msgBox(this);

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);