Default the region to Global so deferring before choosing still installs

configs/airootfs/root/configurator

@@ -1039,6 +1039,7 @@ select_installation() {
 
 defer_provisioning=false
 install_target="full_disk"
+region="global"
 
 # Let the live VT reach its settled width before the first screen so the logo
 # isn't measured against the transient 80-column boot console.