ekf2: remove unused parameter

The logging of replay data is now controlled by the logging module

src/modules/ekf2/ekf2_params.c

@@ -530,18 +530,6 @@ PARAM_DEFINE_FLOAT(EKF2_GPS_V_GATE, 5.0f);
  */
 PARAM_DEFINE_FLOAT(EKF2_TAS_GATE, 3.0f);
 
-/**
- * Replay mode
- *
- * A value of 1 indicates that the ekf2 module will publish
- * replay messages for logging.
- *
- * @group EKF2
- * @reboot_required true
- * @boolean
- */
-PARAM_DEFINE_INT32(EKF2_REC_RPL, 0);
-
 /**
  * Integer bitmask controlling data fusion and aiding methods.
  *