Fix of wxWidgets3.0 again wxGetApp not declared in this scope #6655

src/slic3r/GUI/GUI_Utils.cpp

@@ -1,4 +1,5 @@
 #include "GUI_Utils.hpp"
+#include "GUI_App.hpp"
 
 #include <algorithm>
 #include <boost/lexical_cast.hpp>
@@ -6,10 +7,9 @@
 
 #ifdef _WIN32
     #include <Windows.h>
-#include "GUI_App.hpp"
     #include "libslic3r/AppConfig.hpp"
     #include <wx/msw/registry.h>
-#endif
+#endif // _WIN32
 
 #include <wx/toplevel.h>
 #include <wx/sizer.h>