Remove global site url (#8343)

* remove global site url

* missed one

* revert mysterious change

utils/api.go

@@ -52,7 +52,7 @@ func RenderWebError(w http.ResponseWriter, r *http.Request, status int, params u
 		http.Error(w, "", http.StatusInternalServerError)
 		return
 	}
-	destination := strings.TrimRight(GetSiteURL(), "/") + "/error?" + queryString + "&s=" + base64.URLEncoding.EncodeToString(signature)
+	destination := "/error?" + queryString + "&s=" + base64.URLEncoding.EncodeToString(signature)
 
 	if status >= 300 && status < 400 {
 		http.Redirect(w, r, destination, status)

utils/config.go

@@ -34,15 +34,6 @@ const (
 )
 
 var originalDisableDebugLvl l4g.Level = l4g.DEBUG
-var siteURL = ""
-
-func GetSiteURL() string {
-	return siteURL
-}
-
-func SetSiteURL(url string) {
-	siteURL = strings.TrimRight(url, "/")
-}
 
 // FindConfigFile attempts to find an existing configuration file. fileName can be an absolute or
 // relative path or name such as "/opt/mattermost/config.json" or simply "config.json". An empty