fix: removed rounded top corners on webhook form

[avnish100]

What does this PR do?

• Fixes [CAL-5279] Small UI issue in /settings/developer/webhooks/id #19897
• Fixes CAL-5279

Visual Demo (For contributors especially)

Video Demo (if applicable):

• Show screen recordings of the issue or feature.
• Demonstrate how to reproduce the issue, the behavior before and after the change.

Image Demo (if applicable):

Previous :

After Fix :

• Highlight any significant change(s).

Mandatory Tasks (DO NOT REMOVE)

• I have self-reviewed the code (A decent size PR without self-review might be rejected).
• I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox. - N/A
• I confirm automated tests are in place that prove my fix is effective or that my feature works.

How should this be tested?

• Are there environment variables that should be set? - No
• What are the minimal test data to have? - Any Account to access settings page
• What is expected (happy path) to have (input and output)? - No rounded corner
• Any other important info that could help to test that PR - No

Checklist

[vercel]

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[graphite-app]

Graphite Automations

"Add consumer team as reviewer" took an action on this PR • (03/10/25)

1 reviewer was added to this PR based on Keith Williams's automation.

"Add community label" took an action on this PR • (03/10/25)

1 label was added to this PR based on Keith Williams's automation.

"Add ready-for-e2e label" took an action on this PR • (03/10/25)

1 label was added to this PR based on Keith Williams's automation.