updated NaturalNeighbour gui to use new saga parameters

python/plugins/processing/algs/saga/description/NaturalNeighbour.txt

@@ -3,8 +3,10 @@ grid_gridding
 ParameterVector|SHAPES|Points|0|False
 ParameterTableField|FIELD|Attribute|SHAPES|-1|False
 Hardcoded|-TARGET_DEFINITION 0
-ParameterSelection|METHOD|Method|[0] Linear;[1] Sibson;[1] Non-Sibsonian
+ParameterSelection|METHOD|Method|[0] Linear;[1] Sibson;[2] Non-Sibsonian
 Extent TARGET_USER_XMIN TARGET_USER_XMAX TARGET_USER_YMIN TARGET_USER_YMAX
 ParameterNumber|TARGET_USER_SIZE|Cellsize|None|None|100.0
 ParameterSelection|TARGET_USER_FITS|Fit|[0] nodes;[1] cells
 OutputRaster|TARGET_OUT_GRID|Grid
+ParameterNumber|WEIGHT|Minimum Weight|None|None| 0.0
+ParameterRaster|TARGET_TEMPLATE|Target System|True