rcutorture: Remove contradictory Kconfig constraint

The TASKS03 scenario specifies both CONFIG_RCU_EXPERT=y and
removes #CHECK#CONFIG_RCU_EXPERT=n in order to be consistent with
CONFIG_RCU_EXPERT=y prerequisites.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/configs/rcu/TASKS03

@@ -6,6 +6,5 @@ CONFIG_PREEMPT=y
 CONFIG_HZ_PERIODIC=n
 CONFIG_NO_HZ_IDLE=n
 CONFIG_NO_HZ_FULL=y
-#CHECK#CONFIG_RCU_EXPERT=n
 CONFIG_TASKS_RCU=y
 CONFIG_RCU_EXPERT=y