Removed backlog frontend code

app/assets/javascripts/boards/boards_bundle.js.es6

@@ -59,8 +59,6 @@ $(() => {
       gl.boardService.all()
         .then((resp) => {
           resp.json().forEach((board) => {
-            if (board.list_type === 'backlog') return;
-
             const list = Store.addList(board);
 
             if (list.type === 'done') {

app/assets/javascripts/boards/models/list.js.es6

@@ -9,7 +9,7 @@ class List {
     this.position = obj.position;
     this.title = obj.title;
     this.type = obj.list_type;
-    this.preset = ['backlog', 'done', 'blank'].indexOf(this.type) > -1;
+    this.preset = ['done', 'blank'].indexOf(this.type) > -1;
     this.filters = gl.issueBoards.BoardsStore.state.filters;
     this.page = 1;
     this.loading = true;