[HOLD for payment 2024-07-17][$250] Fallback avatar- The background of fallback avatar has the same color as selection highlight

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**Version Number:** 1.4.61-0
**Reproducible in staging?:** Y
**Reproducible in production?:** N
**Found when validating PR :** https://github.com/Expensify/App/pull/38674
**Logs:** https://stackoverflow.com/c/expensify/questions/4856
**Issue reported by:** Applause-Internal team


## Action Performed:
1. Go to staging.new.expensify.com
2. Go to any chat.
3. Go offline.
4. Type @ and search for user that shows the fallback avatar in offline mode.
5. Use keyboard key to highlight the selection.

## Expected Result:
The background of the fallback avatar should be visible when the user with fallback avatar is highlighted in the suggestion list.

## Actual Result:
The background of the fallback avatar has the color as the selection highlight, so the background appears invisible when it is highlighted. This issue occurs in both light and dark mode.

## Workaround:
Unknown

## Platforms:

Which of our officially supported platforms is this issue occurring on?
- [x] Android: Native
- [x] Android: mWeb Chrome
- [x] iOS: Native
- [x] iOS: mWeb Safari
- [x] MacOS: Chrome / Safari
- [x] MacOS: Desktop

## Screenshots/Videos


https://github.com/Expensify/App/assets/115492554/97cf8ee3-7ee4-4dbb-bafb-f5277f0472df

<img width="1440" alt="Bug6443096_1712637992472!Screenshot_2024-04-09_at_12 40 27" src="https://github.com/Expensify/App/assets/115492554/82b8e7ce-1b07-44f3-adb0-3d2abcd821ba">


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<details><summary>Upwork Automation - Do Not Edit</summary>
    <ul>
        <li>Upwork Job URL: https://www.upwork.com/jobs/~017d901ad4a12b6e9e</li>
        <li>Upwork Job ID: 1777661865535434752</li>
        <li>Last Price Increase: 2024-04-09</li>
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<li>tienifr | Contributor | 0</li>
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<details><summary>Issue Owner</summary>Current Issue Owner: @abekkala</details>

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[HOLD for payment 2024-07-17][$250] Fallback avatar- The background of fallback avatar has the same color as selection highlight #39909

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