fix-8833:Additional custom form disappears in attendee form setup

[khangon]

Fixes #8833

Short description of what this resolves:

Display custom form when adding 2 or more custom

Changes proposed in this pull request:

Fix bug "when an organizer creates a second custom the standard and custom questions disappear when the user loads the form again."

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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Name	Status	Preview	Comments	Updated (UTC)
open-event-frontend	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 28, 2023 7:57am

[mariobehling]

Thank you. We will need to test this further with additional testers. Therefore merging it to dev. Thanks!