change: Remove "escape_key_closes" from ACE

This setting is now available under Preferences -> Chat

gajim/common/setting_values.py

@@ -671,7 +671,6 @@ ADVANCED_SETTINGS = {
             'account in the Accounts window. BE CAREFUL, when you are logged '
             'in with a negative priority, you will NOT receive any message '
             'from your server.'),
-        'escape_key_closes': _('Close a chat by pressing the Escape key'),
         'file_transfers_port': '',
         'ft_add_hosts_to_send': _(
             'List of send hosts (comma separated) in '