landing_target_estimator: fix param type: int -> int32_t

src/modules/landing_target_estimator/LandingTargetEstimator.cpp

@@ -317,7 +317,7 @@ void LandingTargetEstimator::_update_params()
 	param_get(_paramHandle.meas_unc, &_params.meas_unc);
 	param_get(_paramHandle.pos_unc_init, &_params.pos_unc_init);
 	param_get(_paramHandle.vel_unc_init, &_params.vel_unc_init);
-	int mode = 0;
+	int32_t mode = 0;
 	param_get(_paramHandle.mode, &mode);
 	_params.mode = (TargetMode)mode;
 	param_get(_paramHandle.scale_x, &_params.scale_x);