swarm: fix flaky delivery tests (#18971)

swarm/network/stream/delivery.go

@@ -259,13 +259,6 @@ func (d *Delivery) RequestFromPeers(ctx context.Context, req *network.Request) (
 			if sp == nil {
 				return true
 			}
-			// nodes that do not provide stream protocol
-			// should not be requested, e.g. bootnodes
-			if !p.HasCap("stream") {
-				// TODO: if we have no errors, delete this if
-				log.Error("Delivery.RequestFromPeers: peer doesn't have stream cap. we should have returned at sp == nil")
-				return true
-			}
 			spID = &id
 			return false
 		})