nemo-python-object.c: Remove Py_XDCREF when using a location widget

extension.

This is a regression from bd48a2d and causes nemo-terminal to
crash nemo.

Fixes #2681

Author: mtwebster

nemo-python/src/nemo-python-object.c

@@ -258,7 +258,6 @@ nemo_python_object_get_widget (NemoLocationWidgetProvider *provider,
 	ret = (GtkWidget *)g_object_ref(py_ret_gobj->obj);
 
  beach:
-    Py_XDECREF(py_uri);
 	Py_XDECREF(py_ret);
 	pyg_gil_state_release(state);
 	return ret;