Make the subscribe button work correctly

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

@@ -1,4 +1,6 @@
 (() => {
+  const Store = gl.issueBoards.BoardsStore;
+
   window.gl = window.gl || {};
 
   gl.issueBoards.BoardNewIssue = Vue.extend({
@@ -27,13 +29,16 @@
         const labels = this.list.label ? [this.list.label] : [];
         const issue = new ListIssue({
           title: this.title,
-          labels
+          labels,
+          subscribed: true
         });
 
         this.list.newIssue(issue)
           .then((data) => {
             // Need this because our jQuery very kindly disables buttons on ALL form submissions
             $(this.$els.submitButton).enable();
+
+            Store.detail.issue = issue;
           })
           .catch(() => {
             // Need this because our jQuery very kindly disables buttons on ALL form submissions

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

@@ -4,7 +4,7 @@ class ListIssue {
     this.title = obj.title;
     this.confidential = obj.confidential;
     this.dueDate = obj.due_date;
-    this.subscribed = true;
+    this.subscribed = obj.subscribed;
     this.labels = [];
 
     if (obj.assignee) {