sched/tracing: Remove the ` from sched_task_util trace point

There is an unwanted trailing character (`) at the end of the
sched_task_util trace point. Remove it.

Change-Id: I49f5282544289aa3a02de7e5d072a9a326f749c4
Signed-off-by: Pavankumar Kondeti <pkondeti@codeaurora.org>