check_repl_update: in progress is a boolean
With the fix for https://pagure.io/freeipa/issue/9171,
nsds5replicaUpdateInProgress is now handled as a boolean.
One remaining occurrence was still handling it as a string
and calling lower() on its value.
Replace with direct boolean comparison.
Fixes: https://pagure.io/freeipa/issue/9218
Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>