Update ShapestoGrid.txt

Better default for saga rasterization

Author: pcav

python/plugins/processing/algs/saga/description/2.1.3/ShapestoGrid.txt

@@ -3,7 +3,7 @@ grid_gridding
 ParameterVector|INPUT|Shapes|-1|False
 ParameterTableField|FIELD|Attribute|INPUT|-1|False
 ParameterSelection|OUTPUT|Output Values|[0] data / no-data;[1] index number; [2] attribute|2
-ParameterSelection|MULTIPLE|Method for Multiple Values|[0] first;[1] last;[2] minimum;[3] maximum;[4] mean
+ParameterSelection|MULTIPLE|Method for Multiple Values|[0] first;[1] last;[2] minimum;[3] maximum;[4] mean|4
 ParameterSelection|LINE_TYPE|Method for Lines|[0] thin;[1] thick
 ParameterSelection|POLY_TYPE|Polygon|[0] node;[1] cell
 ParameterSelection|GRID_TYPE|Preferred Target Grid Type|[0] Integer (1 byte);[1] Integer (2 byte);[2] Integer (4 byte);[3] Floating Point (4 byte);[4] Floating Point (8 byte)|3