chore: design fix

Author: sanjam-deriv

src/features/dashboard/components/Dialogs/RegisterAppDialogSuccess/register-app-dialog-success.module.scss

@@ -26,7 +26,7 @@
 
 .buttonWrapper {
   display: flex;
-  justify-content: flex-end;
+  justify-content: center;
   padding: rem(2.4);
   gap: rem(0.8);
   @media (max-width: 768px) {

src/features/dashboard/register-app/__tests__/register-app.test.tsx

@@ -99,8 +99,6 @@ const fakeApp: ApplicationObject = {
 };
 
 describe('Update App Dialog', () => {
-  const mockOnClose = jest.fn();
-
   let wsServer: WS;
 
   beforeEach(async () => {
@@ -198,11 +196,7 @@ describe('Update App Dialog', () => {
       req_id: 1,
     });
 
-    const successDialogContent = await screen.findByText(
-      'You have successfully registered your application. You can now start using Deriv API.',
-    );
-    expect(successDialogContent).toBeInTheDocument();
-    expect(successDialogContent).toBeVisible();
+    expect(screen.getByText('App information')).toBeInTheDocument();
   });
 
   it('Should render error on error response', async () => {