[BUGFIX][DBAL] Fix ExtensionManager repository insertion

Resolves: #79143
Releases: master
Change-Id: I3cc6f0cff6980439f8f967f8ea627e074444f28c
Reviewed-on: https://review.typo3.org/51108


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Tested-by: Morton Jonuschat <m.jonuschat@mojocode.de>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>