Epic boards - Hide toggled off Open column

Changelog: fixed

app/assets/javascripts/boards/components/board_list.vue

@@ -60,6 +60,9 @@ export default {
           filters: this.filterParams,
         };
       },
+      skip() {
+        return this.isEpicBoard;
+      },
     },
   },
   computed: {

ee/app/assets/javascripts/boards/graphql/epic_board_lists.query.graphql

@@ -5,6 +5,7 @@ query boardListEpics($fullPath: ID!, $boardId: BoardsEpicBoardID!, $filters: Epi
     id
     board: epicBoard(id: $boardId) {
       id
+      hideBacklogList
       lists(epicFilters: $filters) {
         nodes {
           ...EpicBoardListFragment