Revert "FIX: correctly respects full name settings in channel title (#22566)" (#22569)

This reverts commit aa9c7dc924ac59a7bb9a45e9ab96f56defbb2037.

plugins/chat/assets/javascripts/discourse/components/chat-channel-title.hbs

@@ -19,9 +19,7 @@
             <span class="chat-channel-title__name">{{this.usernames}}</span>
           {{else}}
             {{#let @channel.chatable.users.firstObject as |user|}}
-              <span class="chat-channel-title__name">
+              <span class="chat-channel-title__name">{{user.username}}</span>
-                <ChatUserDisplayName @user={{user}} />
-              </span>
               {{#if this.showUserStatus}}
                 <UserStatusMessage
                   @class="chat-channel-title__user-status-message"
@@ -37,6 +35,8 @@
               />
             {{/let}}
           {{/if}}
+        {{else}}
+          <span class="chat-channel-title__name">Add users</span>
         {{/if}}
       </div>
     </div>

plugins/chat/test/javascripts/components/chat-channel-title-test.js

@@ -80,24 +80,6 @@ module("Discourse Chat | Component | chat-channel-title", function (hooks) {
     );
   });
 
-  test("direct message channel - one user showing full name", async function (assert) {
-    this.siteSettings.prioritize_username_in_ux = true;
-    this.user = fabricators.user({
-      username: "joffrey",
-      name: "Joffrey Baratheon",
-    });
-    this.channel = fabricators.directMessageChannel({
-      chatable: fabricators.directMessage({ users: [this.user] }),
-    });
-
-    await render(hbs`<ChatChannelTitle @channel={{this.channel}} />`);
-
-    assert
-      .dom(".chat-user-display-name__username.-first")
-      .hasText(this.user.username);
-    assert.dom(".chat-user-display-name__name").hasText(this.user.name);
-  });
-
   test("direct message channel - multiple users", async function (assert) {
     const channel = fabricators.directMessageChannel();