[#1449] policer: Fix selection of new storage candidates

`Policer` should pass list of selected candidates into `WithNodes`
method of `replicator.Task`. In previous implementation `processNodes`
method passed an opposite list: failed nodes and/or the local one.

Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>

pkg/services/policer/check.go

@@ -97,17 +97,17 @@ func (p *Policer) processNodes(ctx *processPlacementContext, addr *addressSDK.Ad
 			ctx.needLocalCopy = true
 
 			shortage--
-
-			continue
-		}
-
+		} else {
 			callCtx, cancel := context.WithTimeout(ctx, p.headTimeout)
 
 			_, err := p.remoteHeader.Head(callCtx, prm.WithNodeInfo(nodes[i].NodeInfo))
 
 			cancel()
 
-		if !client.IsErrObjectNotFound(err) {
+			if client.IsErrObjectNotFound(err) {
+				continue
+			}
+
 			if err != nil {
 				log.Error("receive object header to check policy compliance",
 					zap.String("error", err.Error()),
@@ -115,8 +115,6 @@ func (p *Policer) processNodes(ctx *processPlacementContext, addr *addressSDK.Ad
 			} else {
 				shortage--
 			}
-
-			continue
 		}
 
 		nodes = append(nodes[:i], nodes[i+1:]...)