Update image for email global style settings

[lydia-xie]

Pull Request/Issue Resolution

Description of Change:

I'm changing..... (could be a link, a new image, a new section, etc.)... because...

Closes #ISSUE_NUMBER_HERE

Is this change associated with a Braze feature/product release?

• Yes (Insert Feature Release Date Here)
• No

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✔️ Pull Request Checklist

• Check that all links work.
• Ensure you have completed our Contributors License Agreement.
• Tag @timothy-kim and @KellieHawks as a reviewer when your work is done and ready to be reviewed for merge. Are you an internal product manager? Reference the internal reviewing chart to tag the appropriate reviewer.
• Tag others as reviewers as necessary.
• If you have modified any links, be sure to add redirects to assets > js > broken_redirect_list.js

⭐ Helpful Wiki Shortcuts

• Writing Style Guide
• Image Style Guide
• Styling Test Page

❗ ATTN: For PR Reviewers

• Read our Reviewing a PR page for more on our reviewing suggestions.
• Read our Previewing Documentation page to see how to check the deployment.
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❗ ATTN: Internal Reviewing Chart

Work at Braze and not sure who to tag for review?
Before tagging @timothy-kim or @KellieHawks for a general review, reference the following chart to see if a specific product vertical/reviewer applies to your pull request.

Reviewer	Product Vertical
@josh-mccrowell-braze	Monolith Deployments Quality Infrastructure Platform Infrastructure Datalake SDKs
@KellieHawks	Currents Internal Tools Product Partnerships SMS Customer Lifecycle, Identity and Permissions
@bre-fitzgerald	Reporting Intelligence User Targeting IAM Channels FIX
@lydia-xie	Ingestion Core Objects Core Messaging Messaging and Automation Email (Composition and Infrastructure)

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