Don't remove existsing screenshots and games

utils/appstream.py

@@ -57,6 +57,7 @@ tags = { x.name : x for x in Tag.query.all() }
 admin_user = User.query.filter_by(username="appstream").first()
 
 
+'''
 for ss in PackageScreenshot.query.all():
     if ss.package.cover_image == ss:
         ss.package.cover_image = None
@@ -67,6 +68,7 @@ for ss in PackageScreenshot.query.all():
 for game in Package.query.all():
     session.delete(game)
     session.commit()
+'''
 
 if not admin_user:
     admin_user = User("appstream")