increased time for less strict takeoff detection after arming

src/modules/land_detector/LandDetector.h

@@ -100,7 +100,7 @@ protected:
 	static constexpr uint64_t LAND_DETECTOR_TRIGGER_TIME = 2000000;  /**< usec that landing conditions have to hold
                                                                           before triggering a land */
 	static constexpr uint64_t LAND_DETECTOR_ARM_PHASE_TIME =
-		1000000;	/**< time interval in which wider acceptance thresholds are used after arming */
+		2000000;	/**< time interval in which wider acceptance thresholds are used after arming */
 
 protected:
 	orb_advert_t				_landDetectedPub;		/**< publisher for position in local frame */