Update ShapestoGrid.txt

Backport from 2.1.3

Author: pcav

python/plugins/processing/algs/saga/description/2.1.2/ShapestoGrid.txt

@@ -3,9 +3,9 @@ grid_gridding
 Hardcoded|-TARGET 0
 ParameterVector|INPUT|Shapes|-1|False
 ParameterTableField|FIELD|Attribute|INPUT|-1|False
-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|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)
+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
 Extent USER_XMIN USER_XMAX USER_YMIN USER_YMAX
 ParameterNumber|USER_SIZE|Cellsize|None|None|100.0
-OutputRaster|USER_GRID|Grid
+OutputRaster|USER_GRID|Grid