propagate only necessary root flags to TApplication.

src/musredit_qt6/mupp/plotter/mupp_plot.cpp

@@ -77,7 +77,7 @@ int main(int argc, char *argv[])
     }
   }
 
-  TApplication app("App", &argc, argv);
+  TApplication app("App", nullptr, nullptr);
 
   Bool_t ok=kTRUE;
   PMuppCanvas *muppCanvas = new PMuppCanvas("mupp", 10, 10, 600, 800,