DEV: Fix some more flaky tests (#9384)

Includes:
* DEV: Don't overwrite a computed property in test

test/javascripts/acceptance/emoji-picker-test.js

@@ -3,6 +3,10 @@ import { IMAGE_VERSION as v } from "pretty-text/emoji/version";
 
 acceptance("EmojiPicker", {
   loggedIn: true,
+  beforeEach() {
+    const store = Discourse.__container__.lookup("service:emoji-store");
+    store.reset();
+  },
   afterEach() {
     const store = Discourse.__container__.lookup("service:emoji-store");
     store.reset();

test/javascripts/controllers/preferences-account-test.js

@@ -7,27 +7,26 @@ QUnit.test("updating of associated accounts", function(assert) {
       enable_google_oauth2_logins: true
     },
     model: EmberObject.create({
+      id: 70,
       second_factor_enabled: true,
       is_anonymous: true
     }),
+    currentUser: EmberObject.create({
+      id: 1234,
+    }),
     site: EmberObject.create({
       isMobileDevice: false
     })
   });
 
-  controller.set("canCheckEmails", false);
-
   assert.equal(controller.get("canUpdateAssociatedAccounts"), false);
 
   controller.set("model.second_factor_enabled", false);
-
   assert.equal(controller.get("canUpdateAssociatedAccounts"), false);
 
   controller.set("model.is_anonymous", false);
-
   assert.equal(controller.get("canUpdateAssociatedAccounts"), false);
 
-  controller.set("canCheckEmails", true);
-
+  controller.set("model.id", 1234);
   assert.equal(controller.get("canUpdateAssociatedAccounts"), true);
 });

test/javascripts/lib/emoji-store-test.js

@@ -1,4 +1,8 @@
 QUnit.module("lib:emoji-store", {
+  beforeEach() {
+    const store = Discourse.__container__.lookup("service:emoji-store");
+    store.reset();
+  },
   afterEach() {
     const store = Discourse.__container__.lookup("service:emoji-store");
     store.reset();