mc_pos_control_params: remove unused MPC_MANTHR_MAX params

ROMFS/px4fmu_common/init.d/4900_crazyflie

@@ -47,7 +47,6 @@ then
 	param set MC_YAW_P 3.0
 
 	param set MPC_THR_HOVER 0.7
-	param set MPC_MANTHR_MAX 1.0
 	param set MPC_THR_MAX 1.0
 	param set MPC_Z_P 1.5
 	param set MPC_Z_VEL_I 0.3

src/modules/mc_pos_control/mc_pos_control_params.c

@@ -100,20 +100,6 @@ PARAM_DEFINE_FLOAT(MPC_THR_MAX, 1.0f);
  */
 PARAM_DEFINE_FLOAT(MPC_MANTHR_MIN, 0.08f);
 
-/**
- * Maximum manual thrust
- *
- * Limit max allowed thrust for Manual mode.
- *
- * @unit norm
- * @min 0.0
- * @max 1.0
- * @decimal 2
- * @increment 0.01
- * @group Multicopter Position Control
- */
-PARAM_DEFINE_FLOAT(MPC_MANTHR_MAX, 1.0f);
-
 /**
  * Proportional gain for vertical position error
  *