Fix delete domain dialog width and CTA

[wojtekn]

Related to https://github.com/Automattic/dotcom-forge/issues/9788

Proposed Changes

I propose to fix delete domain dialog width as it's too wide. Also, I fixed the primary action button on mobile, as the button content was not centered correctly.

Why are these changes being made?

To improve UX.

Testing Instructions

1. Open Calypso locally or use a Calypso Live link
2. Navigate to the /domains/manage page
3. Locate a domain and click it
4. Click the 'Delete' button
5. Confirm that dialog is no longer too wide
6. Change browser width to mobile view
7. Confirm that dialog is 90% wide and that text on ll buttons is centered

Mobile

Before	After

Desktop

Before	After

Pre-merge Checklist

• Has the general commit checklist been followed? (PCYsg-hS-p2)
• Have you written new tests for your changes?
• Have you tested the feature in Simple (P9HQHe-k8-p2), Atomic (P9HQHe-jW-p2), and self-hosted Jetpack sites (PCYsg-g6b-p2)?
• Have you checked for TypeScript, React or other console errors?
• Have you used memoizing on expensive computations? More info in Memoizing with create-selector and Using memoizing selectors and Our Approach to Data
• Have we added the "[Status] String Freeze" label as soon as any new strings were ready for translation (p4TIVU-5Jq-p2)?
  • For UI changes, have we tested the change in various languages (for example, ES, PT, FR, or DE)? The length of text and words vary significantly between languages.
• For changes affecting Jetpack: Have we added the "[Status] Needs Privacy Updates" label if this pull request changes what data or activity we track or use (p4TIVU-aUh-p2)?

[github-actions]

Calypso Live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126192

Jetpack Cloud live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126192&env=jetpack

Automattic for Agencies live (direct link)

https://calypso.live?image=registry.a8c.com/calypso/app:build-126192&env=a8c-for-agencies

[matticbot]

This PR does not affect the size of JS and CSS bundles shipped to the user's browser.

Generated by performance advisor bot at iscalypsofastyet.com.

[ivan-ottinger]

The proposed changes look good! Both dialogs ("Delete {domain}" & "Confirm your decision") are 90% wide and button labels are centered correctly.

I did not observe any regressions. Tested with different screen sizes.

Desktop	Mobile