Fix ScreenshotTest

[irfano]

Closes: #https://github.com/woocommerce/woomobile-private/issues/393

Description

This fixes failing ScreenshotTest and related script in Fastfile.

Steps to reproduce

1. Run ScreenshotTest.
2. Run bundle exec fastlane take_screenshotslocales:en-US.

Testing information

ScreenshotTest

The test should pass.

bundle exec fastlane take_screenshotslocales:en-US

This command should generate screenshots in /fastlane/screenshots/raw/en-US/images/phoneScreenshots

The tests that have been performed

Generated raw screenhots.

• [x] I have considered if this change warrants release notes and have added them to RELEASE-NOTES.txt if necessary. Use the "[Internal]" label for non-user-facing changes.

Reviewer (or Author, in the case of optional code reviews):

Please make sure these conditions are met before approving the PR, or request changes if the PR needs improvement:

• [x] The PR is small and has a clear, single focus, or a valid explanation is provided in the description. If needed, please request to split it into smaller PRs.
• [ ] Ensure Adequate Unit Test Coverage: The changes are reasonably covered by unit tests or an explanation is provided in the PR description.
• [x] Manual Testing: The author listed all the tests they ran, including smoke tests when needed (e.g., for refactorings). The reviewer confirmed that the PR works as expected on big (tablet) and small (phone) in case of UI changes, and no regressions are added.

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce-Wear Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce-Wear Android
	Platform	⌚️ Wear OS
	Flavor	Jalapeno
	Build Type	Debug
	Commit	de64bb3b957c9542b0b918ccdc8c86fca1cd8b96
	Direct Download	woocommerce-wear-prototype-build-pr12906-de64bb3.apk

[wpmobilebot]

📲 You can test the changes from this Pull Request in WooCommerce Android by scanning the QR code below to install the corresponding build.

	App Name	WooCommerce Android
	Platform	📱 Mobile
	Flavor	Jalapeno
	Build Type	Debug
	Commit	de64bb3b957c9542b0b918ccdc8c86fca1cd8b96
	Direct Download	woocommerce-prototype-build-pr12906-de64bb3.apk

[JorgeMucientes]

Great job fixing this @irfano! Works well. I could run the Screenshots class successfully. However, as discussed over DM I was not able to run bundle exec fastlane take_screenshotslocales:en-US due to my local setup. Since the main changes belong to the Screenshots class and related, not being able to run the fastlane command shouldn't be an issue. Let's :shipit: