Fixes bugs with 'collapsed' saved to cookies (#4080)

Credit to @w20k. Fixes #4047

modules/backend/assets/js/october-min.js

@@ -1102,8 +1102,8 @@ self.saveGroupStatus($(group).data('group-code'),true)}})}
 SidenavTree.prototype.expandGroup=function(group,duration){var
 $list=$('> ul',group),self=this
 duration=duration===undefined?100:duration
-$list.css({'overflow':'hidden','display':'','height':0})
-$list.animate({'height':$list[0].scrollHeight},{duration:duration,queue:false,complete:function(){$list.css({'overflow':'visible','height':'auto'})
+$list.css({'overflow':'hidden','height':0})
+$list.animate({'height':$list[0].scrollHeight},{duration:duration,queue:false,complete:function(){$list.css({'overflow':'visible','height':'auto','display':''})
 $(group).attr('data-status','expanded')
 $(window).trigger('oc.updateUi')
 self.saveGroupStatus($(group).data('group-code'),false)}})}

modules/backend/assets/js/october.sidenav-tree.js

@@ -100,13 +100,13 @@
 
         $list.css({
             'overflow': 'hidden',
-            'display': '',
             'height': 0
         })
         $list.animate({'height': $list[0].scrollHeight}, { duration: duration, queue: false, complete: function() {
             $list.css({
                 'overflow': 'visible',
-                'height': 'auto'
+                'height': 'auto',
+                'display': ''
             })
             $(group).attr('data-status', 'expanded')
             $(window).trigger('oc.updateUi')

modules/system/partials/_settings_menu_items.htm

@@ -15,7 +15,7 @@
                 <h3><?= e(trans($category)) ?></h3>
             </div>
 
-            <ul>
+            <ul <?= $collapsed ? 'style="overflow: visible; height: 0px; display: none;"' : null ?>>
                 <?php foreach ($items as $item): ?>
                     <li class="<?= strtolower($item->owner) == $context->owner && strtolower($item->code) == $context->itemCode ? 'active' : false ?>" data-keywords="<?= e(trans($item->keywords)) ?>">
                         <a href="<?= $item->url ?>" ontouchstart="">