cmd/syncthing: We can use Go 1.8 constants now

cmd/syncthing/main.go

@@ -691,8 +691,8 @@ func syncthingMain(runtimeOptions RuntimeOptions) {
 		InsecureSkipVerify:     true,
 		MinVersion:             tls.VersionTLS12,
 		CipherSuites: []uint16{
-			0xCCA8, // TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305, Go 1.8
-			0xCCA9, // TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305, Go 1.8
+			tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
+			tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
 			tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
 			tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
 			tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,