DEV: Bump thread page size to 100 (#21691)

We don't have proper pagination yet so this
should help us in the interim.

plugins/chat/assets/javascripts/discourse/components/chat-thread.js

@@ -10,7 +10,7 @@ import { next, schedule } from "@ember/runloop";
 import discourseLater from "discourse-common/lib/later";
 import { resetIdle } from "discourse/lib/desktop-notifications";
 
-const PAGE_SIZE = 50;
+const PAGE_SIZE = 100;
 
 export default class ChatThreadPanel extends Component {
   @service siteSettings;