[BUGFIX] Wrong position of init

As storeIncomingData depends on some data,
which is generated in init, the init method
has to be called before.

Resolves: #79374
Releases: master, 7.6
Change-Id: I55e9f1317db83205b3a9ad0105eb8b493203ced7
Reviewed-on: https://review.typo3.org/51344


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Mona Muzaffar <mona.muzaffar@gmx.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Benni Mack <benni@typo3.org>
Tested-by: Benni Mack <benni@typo3.org>