Place focus logic in MacNewFile since MacReopenApp is no longer used

Author: facelessuser

rummage/lib/gui/app/rummage_app.py

@@ -136,4 +136,5 @@ def process_args(self, arguments):
     def MacNewFile(self, fileName=None):
         """Handle new window event."""
 
-        self.MacReopenApp()
+        frame = self.GetTopWindow()
+        platform_window_focus(frame)