[backport core/1.37] Fix: Update for Image Widget test (#8061)

Backport of #8031 to `core/1.37`

Automatically created by backport workflow.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-8061-backport-core-1-37-Fix-Update-for-Image-Widget-test-2e96d73d365081908903d331043cac80)
by [Unito](https://www.unito.io)

---------

Co-authored-by: Alexander Brown <drjkl@comfy.org>
Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Alexander Brown <448862+DrJKL@users.noreply.github.com>

browser_tests/tests/widget.spec.ts

@@ -194,7 +194,10 @@ test.describe('Image widget', () => {
     const comboEntry = comfyPage.page.getByRole('menuitem', {
       name: 'image32x32.webp'
     })
-    await comboEntry.click({ noWaitAfter: true })
+    await comboEntry.click()
+
+    // Stabilization for the image swap
+    await comfyPage.nextFrame()
 
     // Expect the image preview to change automatically
     await expect(comfyPage.canvas).toHaveScreenshot(