Blimp: remove land_acel_ef_filter

Landing is for wimps

Blimp/Blimp.cpp

@@ -289,7 +289,6 @@ Blimp::Blimp(void)
     : logger(g.log_bitmask),
       flight_modes(&g.flight_mode1),
       control_mode(Mode::Number::MANUAL),
-      land_accel_ef_filter(LAND_DETECTOR_ACCEL_LPF_CUTOFF),
       rc_throttle_control_in_filter(1.0f),
       inertial_nav(ahrs),
       param_loader(var_info),

Blimp/Blimp.h

@@ -209,7 +209,6 @@ private:
 
     // Altitude
     int32_t baro_alt;            // barometer altitude in cm above home
-    LowPassFilterVector3f land_accel_ef_filter; // accelerations for land and crash detector tests
 
     // filtered pilot's throttle input used to cancel landing if throttle held high
     LowPassFilterFloat rc_throttle_control_in_filter;