Filters are not accessible if batch actions are disabled

[RobertAudi]

When batch actions are disabled the .table_tools div is not rendered. However the sidebar is unconditionnaly hidden using javascript here:

light_admin/app/assets/javascripts/light_admin/filters_toggle.js

Lines 4 to 8 in 335d178

	if (!window.location.search.includes('Filter')) {
	$('div#sidebar').hide();
	$('#main_content').css({ 'margin-right': '0px' });
	$('a#toggleFilters').removeClass('epon');
	}

The only way to show the sidebar is by clicking on the "Filters" button but it's never added to the DOM since the .table_tools element is missing:

light_admin/app/assets/javascripts/light_admin/filters_toggle.js

Line 2 in 335d178

$('#active_admin_content .table_tools').append('<a id="toggleFilters" href="#" class=\'epon\'>Filtres</a>');

Note that all sidebard are affected by this, not only the filters panel in the sidebar.