[SE-3458] Fix the broken Ocim registration form

This PR fixes OCIM frontend broken issue introduced by https://github.com/open-craft/opencraft/pull/647

JIRA tickets: https://tasks.opencraft.com/browse/SE-3458

Discussions:

Dependencies: None

Screenshots: N/A

Sandbox URL: TBD

Merge deadline: "ASAP"

Testing instructions:

1. From the Domain input page, enter a valid unused subdomain
2. It should redirect to the next page after validating

Author notes and concerns: N/A

Reviewers

• (OpenCraft internal reviewer's GitHub username goes here)

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