Set EKF2 as default estimator

Author: LorenzMeier

src/modules/systemlib/system_params.c

@@ -103,7 +103,7 @@ PARAM_DEFINE_INT32(SYS_RESTART_TYPE, 2);
  * @reboot_required true
  * @group System
  */
-PARAM_DEFINE_INT32(SYS_MC_EST_GROUP, 1);
+PARAM_DEFINE_INT32(SYS_MC_EST_GROUP, 2);
 
 /**
  * TELEM2 as companion computer link