Alerting: fix SCC-S1017 linting issue in codebase (#47683)

pkg/services/alerting/notifiers/hipchat.go

@@ -55,9 +55,7 @@ const (
 // for the HipChatNotifier
 func NewHipChatNotifier(model *models.AlertNotification, _ alerting.GetDecryptedValueFn, ns notifications.Service) (alerting.Notifier, error) {
 	url := model.Settings.Get("url").MustString()
-	if strings.HasSuffix(url, "/") {
-		url = url[:len(url)-1]
-	}
+	url = strings.TrimSuffix(url, "/")
 	if url == "" {
 		return nil, alerting.ValidationError{Reason: "Could not find url property in settings"}
 	}