header-custom finalmask: Remove headerConnMode headerReadAddrAware interface (#6193)

https://github.com/XTLS/Xray-core/pull/5920#issuecomment-4253108964

https://github.com/XTLS/Xray-core/pull/6193#issuecomment-4531875088

infra/conf/transport_test.go

@@ -195,8 +195,7 @@ func TestHeaderCustomUDPBuild(t *testing.T) {
 				"mode": "standalone"
 			}`,
 			Parser: parser,
-			Output: &finalmaskcustom.UDPConfig{
-				Mode: "standalone",
+			Output: &finalmaskcustom.UDPStandaloneConfig{
 				Client: []*finalmaskcustom.UDPItem{
 					{
 						RandMax: 255,