chore: Update Anvil border radius test (#40103)

## Description

Update tests post
17ac31267b

/ok-to-test tags="@tag.Anvil"

<!-- This is an auto-generated comment: Cypress test results  -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/14301296428>
> Commit: 6f3ec15f89b30b141747c7d9d8df85e5529b5ad5
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=14301296428&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Anvil`
> Spec:
> <hr>Mon, 07 Apr 2025 05:34:01 UTC
<!-- end of auto-generated comment: Cypress test results  -->


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **Style**
- Refined the rounding on interface elements to deliver a more balanced
and modern visual appearance, resulting in smoother and more consistent
component styling.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/cypress/e2e/Regression/ClientSide/Anvil/AppTheming/AnvilAppThemingSnapshot_spec.ts

@@ -60,7 +60,7 @@ describe(
     });
 
     it("5. Corners", () => {
-      ["0px", "6px", "20px"].forEach((corner) => {
+      ["0px", "8px", "20px"].forEach((corner) => {
         anvilSnapshot.setCorners(corner);
 
         anvilSnapshot.matchSnapshotForCanvasMode(`AppThemingCorner${corner}`);