fixed smooth lighting errors on chunk boundaries

overviewer_core/src/rendermodes.h

@@ -165,6 +165,8 @@ typedef struct {
     PyObject *skylight, *blocklight;
     PyObject *left_skylight, *left_blocklight;
     PyObject *right_skylight, *right_blocklight;
+    PyObject *up_left_skylight, *up_left_blocklight;
+    PyObject *up_right_skylight, *up_right_blocklight;
     
     /* light color image, loaded if color_light is True */
     PyObject *lightcolor;