[BUGFIX] Fix wrong array key of default webhook type

Resolves: #104891
Releases: main, 12.4
Change-Id: I7431cd142a1b92e7ca14dcfe1b5720f9a627be04
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/86002


Reviewed-by: Guido Schmechel <guido.schmechel@brandung.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Jochen Roth <rothjochen@gmail.com>
Tested-by: Jochen Roth <rothjochen@gmail.com>
Reviewed-by: Nikita Hovratov <nikita.h@live.de>
Reviewed-by: Oliver Bartsch <bo@cedev.de>
Tested-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Nikita Hovratov <nikita.h@live.de>
Tested-by: Guido Schmechel <guido.schmechel@brandung.de>
Reviewed-by: Andreas Kienast <a.fernandez@scripting-base.de>
Tested-by: Oliver Bartsch <bo@cedev.de>