[BUGFIX] Avoid double base64 encoding for reused ConsumableNonce

Only base64 encode if a new nonce value has been created.

Resolves: #102438
Releases: main, 12.4
Change-Id: I816556feefb787328cadb2ac9e92aec43a5e08a2
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/81893


Reviewed-by: Oliver Hader <oliver.hader@typo3.org>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>