update: fix detection of Triple-T screenshots
update: fix detection of Triple-T screenshots

* https://github.com/westnordost/StreetComplete/issues/489
* https://forum.f-droid.org/t/screenshots-dont-show-up-in-client-using-gradle-play-publisher/881/2

#357

f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroidserver,fdroidtravis/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server,fdroidtravis/fdroidserver,f-droid/fdroidserver,f-droid/fdroidserver,f-droid/fdroid-server,f-droid/fdroid-server,f-droid/fdroidserver,fdroidtravis/fdroidserver,f-droid/fdroid-server