[BUGFIX] Rebuild redirect cache also for new records

EXT:redirects DataHandler hook to flush the redirects cache in
case a redirect is modified does now also work for new redirect
records by removing parts of the early return, which relied on
records having a numeric uid while new records' uid is the known
"NEW.*" string.

Resolves: #99042
Releases: main, 11.5
Change-Id: I3624ceecaefd00c0ffce88fd656dc5d81a5b77de
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/76536


Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Susanne Moog <look@susi.dev>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Reviewed-by: Susanne Moog <look@susi.dev>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>