mc_pos_control: MPC_LAND_TILT_MAX param name is too long, replace with MPC_LAND_TILT

src/modules/mc_pos_control/mc_pos_control_main.cpp

@@ -283,7 +283,7 @@ MulticopterPositionControl::MulticopterPositionControl() :
 	_params_handles.xy_ff		= param_find("MPC_XY_FF");
 	_params_handles.tilt_max	= param_find("MPC_TILT_MAX");
 	_params_handles.land_speed	= param_find("MPC_LAND_SPEED");
-	_params_handles.land_tilt_max	= param_find("MPC_LAND_TILT_MAX");
+	_params_handles.land_tilt_max	= param_find("MPC_LAND_TILT");
 	_params_handles.rc_scale_pitch	= param_find("RC_SCALE_PITCH");
 	_params_handles.rc_scale_roll	= param_find("RC_SCALE_ROLL");
 	_params_handles.rc_scale_yaw	= param_find("RC_SCALE_YAW");

src/modules/mc_pos_control/mc_pos_control_params.c

@@ -55,4 +55,4 @@ PARAM_DEFINE_FLOAT(MPC_XY_VEL_MAX, 5.0f);
 PARAM_DEFINE_FLOAT(MPC_XY_FF, 0.5f);
 PARAM_DEFINE_FLOAT(MPC_TILT_MAX, 1.0f);
 PARAM_DEFINE_FLOAT(MPC_LAND_SPEED, 1.0f);
-PARAM_DEFINE_FLOAT(MPC_LAND_TILT_MAX, 0.4f);
+PARAM_DEFINE_FLOAT(MPC_LAND_TILT, 0.3f);