Filter out locales with numeric region code

This affects only ia-001 (Interlingua world) which is listed as supported locale in Android's locale_config.xml, but the Google Play API doesn't seem to support it for meta data.

For the failure see https://invent.kde.org/pim/itinerary/-/jobs/1565437 where one finds in the task-debug.log:

ia-001 - Invalid request

Filtering out the ia-001 meta data files fixes the problem (I have already deployed the fix to test it): https://invent.kde.org/pim/itinerary/-/jobs/1565780