[IMP] payment_stripe: Fill email on stripe modal to avoid retyping it
[IMP] payment_stripe: Fill email on stripe modal to avoid retyping it

Purpose
=======

Currently, users have to retype email in the stripe payment popup.

For event registration, the email address must be typed 3 times (the first
for the registration information, the second for the billing information
and finally for the payment on the stripe popup)

Specifications
==============

As the email is already filled on billing information view, isn't
necessary to retype in the payment form.

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