tls: revert unauthenticated access for localhost

This is not safe when using tailscale, which proxies traffic to localhost by
default. Thanks to joneskoo@ for the report!

httpsredirect.go

@@ -1,19 +1,11 @@
 package gokrazy
 
 import (
-	"net"
 	"net/http"
 )
 
 func httpsRedirect(redirectPort string) func(w http.ResponseWriter, r *http.Request) {
 	return func(w http.ResponseWriter, r *http.Request) {
-		host, _, _ := net.SplitHostPort(r.RemoteAddr)
-		ip := net.ParseIP(host)
-		if ip.IsLoopback() {
-			http.DefaultServeMux.ServeHTTP(w, r)
-			return
-		}
-
 		r.URL.Host = r.Host
 		if redirectPort != "443" {
 			r.URL.Host += ":" + redirectPort