Merge pull request 'Mailstream: delete cookiejar after fetching image' (#1645) from mexon/friendica-addons:mat/mailstream-delete-cookiejar into develop

Reviewed-on: friendica/friendica-addons#1645
Reviewed-by: Hypolite Petovan <hypolite@mrpetovan.com>

mailstream/mailstream.php

@@ -289,6 +289,7 @@ function mailstream_do_images(array &$item, array &$attachments)
 		$cookiejar = tempnam(System::getTempPath(), 'cookiejar-mailstream-');
 		try {
 			$curlResult = DI::httpClient()->get($url, HttpClientAccept::DEFAULT, [HttpClientOptions::COOKIEJAR => $cookiejar]);
+			unlink($cookiejar);
 			if (!$curlResult->isSuccess()) {
 				DI::logger()->debug('mailstream: fetch image url failed', [
 					'url' => $url,