Fix C++ compiler warning

Author: FluxCapacitor2

backend/regclient-napi/binding.gyp

@@ -9,7 +9,8 @@
       ],
       "conditions": [
         ["OS=='linux'", {
-          "libraries": [ "-lpthread", "-ldl" ]
+          "libraries": [ "-lpthread", "-ldl" ],
+          "cflags": [ "-Werror" ]
         }]
       ],
       "libraries": [ "<!(pwd)/gobuild/main.a" ],

backend/regclient-napi/src/binding.cc

@@ -23,10 +23,10 @@ class GetImageInfoWorker : public AsyncWorker {
     private:
         std::string imageRef;
         std::string result;
-        std::string overrideTLSHostname;
-        std::string overrideTLSState;
         std::string username;
         std::string password;
+        std::string overrideTLSHostname;
+        std::string overrideTLSState;
 };
 
 Value GetImageInfoWrapper(const CallbackInfo& info) {