Don't signal when lowering number of waiting routines

Signal is not needed as we never need to wake up when the waiting
is lowered, only when increased.

staging/src/k8s.io/apiserver/pkg/storage/cacher/watch_progress.go

@@ -125,5 +125,4 @@ func (pr *conditionalProgressRequester) Remove() {
 	pr.mux.Lock()
 	defer pr.mux.Unlock()
 	pr.waiting -= 1
-	pr.cond.Signal()
 }