API Reeder compatibility (#2526)

https://github.com/FreshRSS/FreshRSS/issues/2513

p/api/greader.php

@@ -214,8 +214,10 @@ function token($conf) {
 function checkToken($conf, $token) {
 //http://code.google.com/p/google-reader-api/wiki/ActionToken
 	$user = Minz_Session::param('currentUser', '_');
-	if ($user !== '_' && $token == '') {
-		return true;	//FeedMe	//TODO: Check security consequences
+	if ($user !== '_' && (	//TODO: Check security consequences
+		$token == '' || //FeedMe
+		$token === 'x')) { //Reeder
+		return true;
 	}
 	if ($token === str_pad(sha1(FreshRSS_Context::$system_conf->salt . $user . $conf->apiPasswordHash), 57, 'Z')) {
 		return true;