Don't enable secure cookies when they won't work (#9971)

* Ignore session.cookie_secure errors
They happen if the session is already started.

* Don't allow secure cookies to be enabled when not accessing via https

* Completely remove the setting

LibreNMS/Config.php

@@ -442,10 +442,6 @@ class Config
             self::set('email_from', '"' . self::get('project_name') . '" <' . self::get('email_user') . '@' . php_uname('n') . '>');
         }
 
-        if (self::get('secure_cookies')) {
-            ini_set('session.cookie_secure', 1);
-        }
-
         // If we're on SSL, let's properly detect it
         if (isset($_SERVER['HTTPS'])) {
             self::set('base_url', preg_replace('/^http:/', 'https:', self::get('base_url')));