[FIX] website_event: avoid double subscription

Before this commit, you was able to double click on the button when
are in registration flow. In this case, you subscribe 2 times and so
take 2x more seats, what can be annoying when you have a limited room.

In the same time, we fix the form in the form that generate
strange behaviour like some events not bubbled correctly.

The attendee form (into the modal) was inside the registration form.
$'attendee_form).on('submit') obviously failed due to this bad dom.

This commit closes opw-778191

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