fixup! Make WitnessUnknown members private

Author: achow101

src/key_io.cpp

@@ -190,7 +190,7 @@ CTxDestination DecodeDestination(const std::string& str, const CChainParams& par
                 return CNoDestination();
             }
 
-            return WitnessUnknown{version, data};
+            return WitnessUnknown{static_cast<unsigned int>(version), data};
         } else {
             error_str = strprintf("Invalid padding in Bech32 data section");
             return CNoDestination();