manual_control: method can be static

src/modules/manual_control/ManualControlSelector.hpp

@@ -51,7 +51,7 @@ public:
 	int instance() const { return _instance; };
 
 private:
-	manual_control_setpoint_s setpoint_from_input(const manual_control_input_s &input);
+	static manual_control_setpoint_s setpoint_from_input(const manual_control_input_s &input);
 
 	manual_control_setpoint_s _setpoint {};
 	uint64_t _timeout {0};