[BUGFIX] Ensure languageId = 0 for new site configurations

When creating a new site configuration, deleting the default language
(English) and importing a new language afterwards now doesn't create an
invalid site configuration with languageId 0 missing.

Resolves: #100439
Releases: main, 12.4
Change-Id: Ic6a83328e92941e4c9894019aab5162f0b3937d9
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/80226


Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>