fix: 修复导航面包屑 同级节点展示弹窗内容溢出问题

Change-Id: Ic56ee490f2d3fc79a2a1842efbe69069d4d0e49d

packages/amis-editor-core/scss/_bcn.scss

@@ -74,7 +74,7 @@
           z-index: 100000; // 设置一个最大的层级
           visibility: hidden;
           transition: all ease-out 0.15s;
-          @include minScrollBar();
+          
           > li > span {
             display: block;
             padding: 6px 12px;

packages/amis-editor-core/src/component/Breadcrumb.tsx

@@ -228,7 +228,7 @@ export default class Breadcrumb extends React.Component<
                       {item.label}
                     </span>
                     {nearby?.length > 1 ? (
-                      <ul>
+                      <ul className='hoverShowScrollBar'>
                         {nearby.map(child => (
                           <li key={`${child.id}-${child.region}`}>
                             <span