Obly hides the help box if the close button is clicked or if issues are added

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

@@ -111,7 +111,7 @@ $(() => {
         class="btn btn-create pull-right prepend-left-10 has-tooltip"
         type="button"
         :disabled="disabled"
-        @click="toggleModal(true)">
+        @click="toggleModal(true, false)">
         Add issues
       </button>
     `,

app/assets/javascripts/boards/components/boards_backlog_help.js.es6

@@ -24,7 +24,10 @@ module.exports = Vue.extend({
           class="close"
           aria-label="Close backlog help"
           @click="toggleModal(false)">
-          <i class="fa fa-times"></i>
+          <i
+            class="fa fa-times"
+            aria-hidden="true">
+          </i>
         </button>
       </h4>
       <div class="backlog-help-icon">${checkmarkIcon}</div>
@@ -39,7 +42,7 @@ module.exports = Vue.extend({
           class="btn btn-success"
           type="button"
           :disabled="disabled"
-          @click="toggleModal(true)">
+          @click="toggleModal(true, false)">
           Add issues
         </button>
       </div>

app/assets/javascripts/boards/components/modal/footer.js.es6

@@ -74,7 +74,7 @@ require('./lists_dropdown');
         <button
           class="btn btn-default pull-right"
           type="button"
-          @click="toggleModal(false)">
+          @click="toggleModal(false, false)">
           Cancel
         </button>
       </footer>

app/assets/javascripts/boards/components/modal/header.js.es6

@@ -57,7 +57,7 @@ const modalFilters = require('./filters');
               class="close"
               data-dismiss="modal"
               aria-label="Close"
-              @click="toggleModal(false)">
+              @click="toggleModal(false, false)">
               <span aria-hidden="true">×</span>
             </button>
           </h2>

app/assets/javascripts/boards/mixins/modal_mixins.js.es6

@@ -5,10 +5,12 @@
 
   gl.issueBoards.ModalMixins = {
     methods: {
-      toggleModal(toggleModal) {
-        Cookies.set('boards_backlog_help_hidden', true);
+      toggleModal(toggleModal, setCookie = true) {
+        if (setCookie) {
+          Cookies.set('boards_backlog_help_hidden', true);
+          Store.state.helpHidden = true;
+        }
 
-        Store.state.helpHidden = true;
         ModalStore.store.showAddIssuesModal = toggleModal;
       },
       changeTab(tab) {