fix fastlane screenshots directory

[adityastic]

Describe the chore
images are stored in fastlane/metadata/android/en-US/images for some reason. It is specfied in the documentation to include screenshots in fastlane/metadata/android/en-US/images/phoneScreenshots

Reference : fossasia/badgemagic-app#417. Screenshots are visible without a successful build https://f-droid.org/en/packages/org.fossasia.badgemagic/.

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