mailto link always has a ? suffix even if there is no subject

[lorenzulrich]

The mailto: link generated by the code at

Sitegeist.Archaeopteryx/Neos.Ui/core/src/application/LinkTypes/MailTo/MailTo.tsx

Line 51 in 2722095

let href = `mailto:${email.recipient}?`

always ends with a ?, even though it's only necessary if there is a subject or a mail body. It is only a cosmetic "problem" and doesn't have a negative impact.