Move screenshots to fastlane location

[jplitza]

This (hopefully) will make F-Droid find and display them.

References: https://staging.f-droid.org/en/docs/All_About_Descriptions_Graphics_and_Screenshots/ https://docs.fastlane.tools/actions/supply/#images-and-screenshots

[genofire]

You did not need fastlane and android in your path for F-Droid.

Take a look at https://github.com/kriztan/Pix-Art-Messenger/pull/272

[adolfintel]

Thanks, I was going to do this for the next release