Geodata: Cleanup unneeded matchers & domain: ignore case (#6342)

Completes https://github.com/XTLS/Xray-core/pull/6139

common/geodata/domain_matcher.go

@@ -220,7 +220,7 @@ func parseDomain(d *Domain) (strmatcher.Matcher, error) {
 	case Domain_Regex:
 		return strmatcher.Regex.New(d.Value)
 	case Domain_Domain:
-		return strmatcher.Domain.New(d.Value)
+		return strmatcher.Domain.New(strings.ToLower(d.Value))
 	case Domain_Full:
 		return strmatcher.Full.New(strings.ToLower(d.Value))
 	default: