doc: Fix DocData.merge_from copying old setters and getters

This is not necessary and means that some setters and getters
can end up wrong if they are changed in the bindings but DocData
does not update them when running --doctool.

Fixes #29425.

Co-authored-by: Bojidar Marinov <bojidar.marinov.bg@gmail.com>

editor/doc/doc_data.cpp

@@ -136,9 +136,6 @@ void DocData::merge_from(const DocData &p_data) {
 				const PropertyDoc &pf = cf.properties[j];
 
 				p.description = pf.description;
-				p.setter = pf.setter;
-				p.getter = pf.getter;
-
 				break;
 			}
 		}