[BUGFIX] Install Tool: Re-enable modal actions after execution

In some cases it was missed to enable modal actions again after their
execution in the Install Tool. This patch adds the necessary statements
to enable said buttons again.

Resolves: #101224
Releases: main, 12.4
Change-Id: I793f157302df15912f0506c376d9db2d6041ebcc
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/82871


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