Do previous compose detection per release type

Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>

roles/bodhi2/backend/templates/pungi.rpm.conf.j2

@@ -5,6 +5,7 @@ release_short = '[[ release.id_prefix.title() ]]'
 release_version = '[[ release.version_int ]]'
 release_type = 'updates[% if request.name == 'testing' %]-testing[% endif %]'
 release_is_layered = False
+old_composes_per_release_type = True
 
 # GENERAL SETTINGS
 comps_file = {