[SECURITY] Avoid HTML injection in password recovery mail

The `receiverName` variable used in the password recovery mail of the
Extbase felogin plugin was susceptible to HTML injection due to
missing sanitization. The variable is now passed thru the
`f:format.htmlspecialchars` ViewHelper.

Resolves: #96559
Releases: main, 11.5, 10.4
Change-Id: I60e23c161f7f2fcc87b8870345b10a4c31d7b8db
Security-Bulletin: TYPO3-CORE-SA-2022-004
Security-References: CVE-2022-31049
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74895


Tested-by: Oliver Hader <oliver.hader@typo3.org>
Reviewed-by: Oliver Hader <oliver.hader@typo3.org>