Revert some scrollbar, sidebar and list width changes.

Thanks to xet7 !

Fixes #5585,
fixes https://github.com/wekan/wekan/pull/5583

client/components/lists/list.css

@@ -7,14 +7,12 @@
   border-left: 1px solid #ccc;
   padding: 0;
   float: left;
-  flex: 1;
 }
 [id^="swimlane-"] .list:first-child {
   min-width: 20px;
 }
 .list:first-child {
   border-left: none;
-  flex: none;
 }
 .card-details + .list {
   border-left: none;
@@ -33,9 +31,6 @@
   box-shadow: none;
   height: 100px;
 }
-.list.list-collapsed {
-  flex: none;
-}
 .list.list-composer .open-list-composer,
 .list .list-composer .open-list-composer {
   color: #8c8c8c;
@@ -152,7 +147,6 @@
   display: flex;
   overflow-y: auto;
   padding: 5px 11px;
-  scrollbar-width: none;
 }
 .list-body .minicards {
   flex-grow: 1;

client/components/lists/list.jade

@@ -1,6 +1,6 @@
 template(name='list')
   .list.js-list(id="js-list-{{_id}}"
-                style="{{#unless collapsed}}min-width:{{listWidth}}px;{{/unless}}"
+                style="{{#unless collapsed}}width:{{listWidth}}px;{{/unless}}"
                 class="{{#if collapsed}}list-collapsed{{/if}}")
     +listHeader
     +listBody