Remove style

https://youtrack.weseek.co.jp/issue/GW-7837
- Remove unused scss file

packages/app/src/styles/_bookmark-list.scss

@@ -1,17 +0,0 @@
-.grw-bookmarks-list{
-  .list-group-item {
-    .grw-visible-on-hover {
-      display: none;
-    }
-
-    &:hover {
-      .grw-visible-on-hover {
-        display: block;
-      }
-
-      .grw-count-badge {
-        display: none;
-      }
-    }
-  }
-}

packages/app/src/styles/style-app.scss

@@ -60,7 +60,6 @@
 @import 'page-accessories-modal';
 @import 'page-path';
 @import 'page-tree';
-@import 'bookmark-list';
 @import 'page';
 @import 'page-presentation';
 @import 'page-history';