satellite/uploadselection: avoid String conversation of location during node selection

Converting location to String is not free, better to avoid it.

81cb588c23/storj/location/countrycode.go (L32)

Thanks to Egon, who reported this issue.

See also: https://review.dev.storj.io/c/storj/common/+/10732

Change-Id: Ife348cffa59c020b46914a68be231c6eb75f06c9

satellite/nodeselection/uploadselection/criteria.go

@@ -34,7 +34,7 @@ func (c *Criteria) MatchInclude(node *SelectedNode) bool {
 	}
 
 	for _, code := range c.ExcludedCountryCodes {
-		if code.String() == "" {
+		if code == location.None {
 			continue
 		}
 		if node.CountryCode == code {