br: use the correct unit for pausing schedulers (#33545)
br: use the correct unit for pausing schedulers (#33545)

close pingcap/tidb#33546
c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,c4pt0r/tidb,c4pt0r/tidb,ngaut/tidb,pingcap/tidb,kyle-wang/tidb,ngaut/tidb,ngaut/tidb,kyle-wang/tidb,ngaut/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb,pingcap/tidb,pingcap/tidb,pingcap/tidb,c4pt0r/tidb,kyle-wang/tidb