wallet: do not allow loading descriptor with an invalid ID

If the computed descriptor's ID doesn't match the wallet's
DB spkm ID, return early from the loading process to prevent
DB data from being modified in any post-loading procedure
(e.g 'TopUp' updates the descriptor's data).

src/wallet/walletdb.cpp

@@ -803,6 +803,12 @@ static DBErrors LoadDescriptorWalletRecords(CWallet* pwallet, DatabaseBatch& bat
         }
         pwallet->LoadDescriptorScriptPubKeyMan(id, desc);
 
+        // Prior to doing anything with this spkm, verify ID compatibility
+        if (id != pwallet->GetDescriptorScriptPubKeyMan(desc)->GetID()) {
+            strErr = "The descriptor ID calculated by the wallet differs from the one in DB";
+            return DBErrors::CORRUPT;
+        }
+
         DescriptorCache cache;
 
         // Get key cache for this descriptor