Update DownloadFile method to use generic http.Get()

We do this to avoid the customised http client setting incorrect headers (which are only needed for Arlo webiste) when fetching the files from Amazon S3

util.go

@@ -103,10 +103,12 @@ func (a *Arlo) DownloadFile(url, to string) error {
 
 func (a *Arlo) DownloadFile(url string, w io.Writer) error {
 	msg := fmt.Sprintf("failed to download file (%s)", url)
-	resp, err := a.get(url, "", nil)
+
+	resp, err := http.Get(url)
 	if err != nil {
 		return errors.WithMessage(err, msg)
 	}
+
 	defer resp.Body.Close()
 
 	_, err = io.Copy(w, resp.Body)