get rid of raw pointers for PFourierCanvas where it makes sense.

src/musrFT.cpp

@@ -1503,7 +1503,7 @@ Int_t main(Int_t argc, Char_t *argv[])
     }
     // check that everything is ok
     if (ok)
-      app.Run(true); // true needed that Run will return after quit so that cleanup works
+      app.Run();
   }
 
   return PMUSR_SUCCESS;