offline: disable categories in feedlist when not enabled in tt-rss main

functions.php

@@ -2958,6 +2958,9 @@
 		print "<param key=\"hide_read_feeds\" value=\"" . 
 			(int) get_pref($link, "HIDE_READ_FEEDS") . "\"/>";
 
+		print "<param key=\"enable_feed_cats\" value=\"" . 
+			(int) get_pref($link, "ENABLE_FEED_CATS") . "\"/>";
+
 		print "<param key=\"feeds_sort_by_unread\" value=\"" . 
 			(int) get_pref($link, "FEEDS_SORT_BY_UNREAD") . "\"/>";
 

offline.js

@@ -412,7 +412,7 @@ function viewfeed_offline(feed_id, subop, is_cat, subop_param, skip_history, off
 
 function render_offline_feedlist() {
 	try {
-		var cats_enabled = 1;
+		var cats_enabled = getInitParam("enable_feed_cats") == "1";
 
 		var tmp = "<ul class=\"feedList\" id=\"feedList\">";