MulticopterPositionControl: clarify previous position control naming

src/modules/mc_pos_control/MulticopterPositionControl.cpp

@@ -321,13 +321,13 @@ void MulticopterPositionControl::Run()
 		setDt(dt);
 
 		if (_vehicle_control_mode_sub.updated()) {
-			const bool position_control_enabled = _vehicle_control_mode.flag_multicopter_position_control_enabled;
+			const bool previous_position_control_enabled = _vehicle_control_mode.flag_multicopter_position_control_enabled;
 
 			if (_vehicle_control_mode_sub.update(&_vehicle_control_mode)) {
-				if (!position_control_enabled && _vehicle_control_mode.flag_multicopter_position_control_enabled) {
+				if (!previous_position_control_enabled && _vehicle_control_mode.flag_multicopter_position_control_enabled) {
 					_time_position_control_enabled = _vehicle_control_mode.timestamp;
 
-				} else if (position_control_enabled && !_vehicle_control_mode.flag_multicopter_position_control_enabled) {
+				} else if (previous_position_control_enabled && !_vehicle_control_mode.flag_multicopter_position_control_enabled) {
 					// clear existing setpoint when controller is no longer active
 					_setpoint = {};
 				}