bugfix: Mark CNoDestination and PubKeyDestination constructor explicit

This should fix the bug reported in
https://github.com/bitcoin/bitcoin/pull/28246#discussion_r1371640502,
which caused the GUI to not detect the destination type of recipients,
thus picking the wrong change destination type.

Also, add missing lifetimebound attribute to a getter method.

src/qt/walletmodel.cpp

@@ -187,8 +187,7 @@ WalletModel::SendCoinsReturn WalletModel::prepareTransaction(WalletModelTransact
             setAddress.insert(rcp.address);
             ++nAddresses;
 
-            CScript scriptPubKey = GetScriptForDestination(DecodeDestination(rcp.address.toStdString()));
-            CRecipient recipient = {scriptPubKey, rcp.amount, rcp.fSubtractFeeFromAmount};
+            CRecipient recipient{DecodeDestination(rcp.address.toStdString()), rcp.amount, rcp.fSubtractFeeFromAmount};
             vecSend.push_back(recipient);
 
             total += rcp.amount;