test: fix sequential signing test for new API signature

Update test to include required 'enabled' parameter in
signature flow configuration endpoint.

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

tests/integration/features/sign/sequential_signing.feature

@@ -36,7 +36,8 @@ Feature: sequential-signing
     Given user "signer1" exists
     And user "signer2" exists
     And sending "post" to ocs "/apps/libresign/api/v1/admin/signature-flow/config"
-      | mode | ordered_numeric |
+      | enabled | true            |
+      | mode    | ordered_numeric |
     And the response should have a status code 200
     When sending "post" to ocs "/apps/libresign/api/v1/request-signature"
       | file | {"url":"<BASE_URL>/apps/libresign/develop/pdf"} |