sched/core: Remove duplicate assignment in sched_tick_remote()

A redundant "curr = rq->curr" was added; remove it.

Fixes: ebc0f83c ("timers/nohz: Update NOHZ load in remote tick")
Signed-off-by: Scott Wood <swood@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/1580776558-12882-1-git-send-email-swood@redhat.com