land detector: small refactor while studying

src/modules/land_detector/MulticopterLandDetector.h

@@ -81,9 +81,9 @@ private:
 		param_t maxClimbRate;
 		param_t maxVelocity;
 		param_t maxRotation;
-		param_t maxThrottle;
+		param_t minThrottle;
 		param_t minManThrottle;
-		param_t acc_threshold_m_s2;
+		param_t ff_acc_threshold;
 		param_t ff_trigger_time;
 	} _paramHandle;
 
@@ -91,9 +91,9 @@ private:
 		float maxClimbRate;
 		float maxVelocity;
 		float maxRotation_rad_s;
-		float maxThrottle;
+		float minThrottle;
 		float minManThrottle;
-		float acc_threshold_m_s2;
+		float ff_acc_threshold;
 		float ff_trigger_time;
 	} _params;