Bug 34478: Correct op value for SMS provider deletion

The op value is set in the JavaScript, where it hasn't been updated to
match the "cud-delete" value checked in the script.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>

koha-tmpl/intranet-tmpl/prog/js/sms_providers.js

@@ -70,7 +70,7 @@ function delete_provider( id, users ) {
     }
 
     if ( c ) {
-        $("#op").val('delete');
+        $("#op").val('cud-delete');
         $("#id").val( id );
         $("#sms_form").submit();
     }