Bring PrusaSlicer to top when drag and dropping a project file on its executable

src/slic3r/GUI/Plater.cpp

@@ -2137,6 +2137,7 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
         for (size_t i = 0; i < evt.data.size(); ++i) {
             input_files.push_back(from_u8(evt.data[i].string()));
         }
+        wxGetApp().mainframe->Raise();
         this->q->load_files(input_files);
     });
 #else