refactor(e2e): update dialog interactions for playlist addition in tests

Entire-Checkpoint: 84693b066142

apps/web-e2e/src/xtream.e2e.ts

@@ -55,8 +55,8 @@ async function addXtreamPortal(
     } = options;
 
     await page.getByRole('button', { name: 'Add playlist' }).click();
-    await page.getByRole('menuitem', { name: /Add Xtreme Code/i }).click();
     const dialog = page.locator('mat-dialog-container');
+    await dialog.getByRole('button', { name: 'Xtream' }).click();
 
     await dialog.locator('#title').fill(name);
     await dialog.locator('#serverUrl').fill(MOCK_SERVER);