Disallow copy of CReserveKeys

src/wallet/wallet.h

@@ -1009,6 +1009,10 @@ public:
         pwallet = pwalletIn;
     }
 
+    CReserveKey() = default;
+    CReserveKey(const CReserveKey&) = delete;
+    CReserveKey& operator=(const CReserveKey&) = delete;
+
     ~CReserveKey()
     {
         ReturnKey();