Revert "Avoid updating feed based on user pref DEFAULT_UPDATE_INTERVAL if it is set to -1 (no update)"

This reverts commit bca1cfbb95.

include/rssfuncs.php

@@ -77,7 +77,6 @@
 		if (DB_TYPE == "pgsql") {
 			$update_limit_qpart = "AND ((
 					ttrss_feeds.update_interval = 0
-					AND ttrss_user_prefs.value > 0
 					AND ttrss_feeds.last_updated < NOW() - CAST((ttrss_user_prefs.value || ' minutes') AS INTERVAL)
 				) OR (
 					ttrss_feeds.update_interval > 0
@@ -87,7 +86,6 @@
 		} else {
 			$update_limit_qpart = "AND ((
 					ttrss_feeds.update_interval = 0
-					AND ttrss_user_prefs.value > 0
 					AND ttrss_feeds.last_updated < DATE_SUB(NOW(), INTERVAL CONVERT(ttrss_user_prefs.value, SIGNED INTEGER) MINUTE)
 				) OR (
 					ttrss_feeds.update_interval > 0