add missing styles to highlight redirects / editor's picks menu items

wagtail/wagtailadmin/static/wagtailadmin/scss/components/main-nav.scss

@@ -49,6 +49,8 @@ $submenu-color:darken($color-grey-1, 5%);
             .menu-users &.menu-users,
             .menu-groups &.menu-groups,
             .menu-sites &.menu-sites,
+            .menu-redirects &.menu-redirects,
+            .menu-editorspicks &.menu-editors-picks,
             .menu-snippets &.menu-snippets,
             .menu-documents &.menu-documents,
             .menu-images &.menu-images,