Fix copying of remote files with Python 3

This closes LP #1313112

Author: toobaz

sourcecodebrowser/plugin.py

@@ -413,7 +413,7 @@ def _load_active_document_symbols(self):
                         contents = document.get_text(document.get_start_iter(),
                                                      document.get_end_iter(),
                                                      True)
-                        os.write(fd, contents)
+                        os.write(fd, bytes(contents, 'UTF-8'))
                         os.close(fd)
                         while Gtk.events_pending():
                             Gtk.main_iteration()