remove debug code

src/modules/butterflies/butterflies_overlays.c

@@ -31,7 +31,6 @@ enum action_status bf_grid_overlay_update(const struct cats_configuration *conf,
                                 continue;
                         }
 
-                        data->info_layer[row][col] = BF_CELL_VALID_DISPERSAL_TARGET;
 
                         if (conf->overlays.overlay[OL_HABITAT_TYPE_CC].enabled &&
                             conf->overlays.habitat_cc->data[row][col] > 0) {