cluster: fix race when getting coordinator (#8037)

close #8036

Signed-off-by: Cabinfever_B <cabinfeveroier@gmail.com>

Co-authored-by: ti-chi-bot[bot] <108142056+ti-chi-bot[bot]@users.noreply.github.com>

server/cluster/cluster.go

@@ -1940,7 +1940,7 @@ func (c *RaftCluster) updateProgress(storeID uint64, storeAddress, action string
 	switch action {
 	case removingAction:
 		progressName = encodeRemovingProgressKey(storeID)
-		opts = []progress.Option{progress.WindowDurationOption(c.coordinator.GetPatrolRegionsDuration())}
+		opts = []progress.Option{progress.WindowDurationOption(c.GetCoordinator().GetPatrolRegionsDuration())}
 	case preparingAction:
 		progressName = encodePreparingProgressKey(storeID)
 	}