Check if warning should be displayed on connect

This is to display the warning when the user changes the calculation
mode and then reloads the page, or when the user changes the calculation
mode, navigates away and then goes back to the settings page.

frontend/src/stimulus/controllers/dynamic/admin/progress-tracking.controller.ts

@@ -49,6 +49,10 @@ export default class ProgressTrackingController extends Controller {
   declare readonly warningTextTarget:HTMLElement;
   declare readonly warningToastTarget:HTMLElement;
 
+  connect() {
+    this.displayWarning();
+  }
+
   displayWarning() {
     const warningMessageHtml = this.getWarningMessageHtml();
     if (warningMessageHtml) {