Update Dark Mode - Test Cases - TC003 screenshot

## Description
During the [sanity check testing](https://github.com/wordpress-mobile/gutenberg-mobile/pull/3078#issuecomment-772092411) for release `1.46.0` we spotted that one of screenshot of a test case doesn't reflect recent changes.

Specifically [Dark Mode - Test Cases - TC003 - MediaText Block - Check if in DarkMode all components gets proper colors](https://github.com/wordpress-mobile/test-cases/blob/trunk/test-cases/gutenberg/darkmode.md#tc003), the expected look screenshot shows the vertical alignment options but they're no longer inlined.

It should look like this with the toolbar buttons updated:

<img src=https://user-images.githubusercontent.com/14905380/106883162-e8898980-66df-11eb-8547-f6abaad5d82a.png width=400>

Previous one:

<img src="https://github.com/wordpress-mobile/test-cases/blob/trunk/test-cases/resources/mediatext-dark-mode.png?raw=true" width=400>

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Update Dark Mode - Test Cases - TC003 screenshot #67

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Update Dark Mode - Test Cases - TC003 screenshot #67

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