propagate only necessary root flags to TApplication.

src/musrt0.cpp

@@ -779,7 +779,7 @@ Int_t main(Int_t argc, Char_t *argv[])
     //   3) set the data-, and bkg-range
     if (success) {
       // generate Root application needed for PMusrCanvas
-      TApplication app("App", &argc, argv);
+      TApplication app("App", nullptr, nullptr);
 
       PMusrT0Data musrT0Data;
       std::vector<PRawRunData*> rawRunData;