spam in sending emails

[luanluciano93]

https://github.com/Znote/ZnoteAAC/blob/c2cdf5f3bf7c2f73a3b00467191fe80cdbcfe091/myaccount.php#L77

Hello Znote.

I was testing the site created by you and I came across this problem: when you click on the email authentication button, you receive the message that an email has been sent with the authentication link, however, each time the user wants to update the page, a new email will be sent, I think that somehow it can create a spam with this problem.