functionObject: Call 'execute' then 'write' from the default 'end' function.

src/OpenFOAM/db/functionObjects/functionObject/functionObject.C

@@ -122,7 +122,7 @@ const Foam::word& Foam::functionObject::name() const
 
 bool Foam::functionObject::end()
 {
-    return execute();
+    return execute() && write();
 }