Remove RequestURI() hack

I can't remember why this change was done.

Let's use only the standard lib.

But it seems to break URL like this one: https://www.deimeke.net/dirk/blog/index.php?/feeds/index.rss2

url/url.go

@@ -7,7 +7,6 @@ package url // import "miniflux.app/url"
 import (
 	"fmt"
 	"net/url"
-	"sort"
 	"strings"
 )
 
@@ -81,51 +80,3 @@ func Domain(websiteURL string) string {
 
 	return parsedURL.Host
 }
-
-// RequestURI returns the encoded URI to be used in HTTP requests.
-func RequestURI(websiteURL string) string {
-	u, err := url.Parse(websiteURL)
-	if err != nil {
-		return websiteURL
-	}
-
-	queryValues := u.Query()
-	u.RawQuery = "" // Clear RawQuery to make sure it's encoded properly.
-	u.Fragment = "" // Clear fragment because Web browsers strip #fragment before sending the URL to a web server.
-
-	var buf strings.Builder
-	buf.WriteString(u.String())
-
-	if len(queryValues) > 0 {
-		buf.WriteByte('?')
-
-		// Sort keys.
-		keys := make([]string, 0, len(queryValues))
-		for k := range queryValues {
-			keys = append(keys, k)
-		}
-		sort.Strings(keys)
-
-		i := 0
-		for _, key := range keys {
-			keyEscaped := url.QueryEscape(key)
-			values := queryValues[key]
-			for _, value := range values {
-				if i > 0 {
-					buf.WriteByte('&')
-				}
-				buf.WriteString(keyEscaped)
-
-				// As opposed to the standard library, we append the = only if the value is not empty.
-				if value != "" {
-					buf.WriteByte('=')
-					buf.WriteString(url.QueryEscape(value))
-				}
-
-				i++
-			}
-		}
-	}
-
-	return buf.String()
-}