[processing] Fix saga natural neighbor parameters

fixes #16604

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

@@ -3,8 +3,10 @@ grid_gridding
 QgsProcessingParameterFeatureSource|SHAPES|Points|0|None|False
 QgsProcessingParameterField|FIELD|Attribute|None|SHAPES|-1|False|False
 Hardcoded|-TARGET_DEFINITION 0
-QgsProcessingParameterBoolean|SIBSON|Sibson|True
+QgsProcessingParameterEnum|METHOD|Method|[0] Linear;[1] Sibson; [2] Non-Sibson
 QgsProcessingParameterExtent|TARGET_USER_XMIN TARGET_USER_XMAX TARGET_USER_YMIN TARGET_USER_YMAX|Output extent|None|True
 QgsProcessingParameterNumber|TARGET_USER_SIZE|Cellsize|QgsProcessingParameterNumber.Double|100.0|False|None|None
 QgsProcessingParameterEnum|TARGET_USER_FITS|Fit|[0] nodes;[1] cells
 QgsProcessingParameterRasterDestination|TARGET_OUT_GRID|Grid
+QgsProcessingParameterNumber|WEIGHT|Minimum Weight|QgsProcessingParameterNumber.Double|0.0|False|None|0.0
+QgsProcessingParameterRasterLayer|TARGET_TEMPLATE|Target System|None|True