[BUGFIX] Disable new content buttons until module is loaded

Each link triggering the "New content element" wizard is now initially
disabled and gets enabled once the according module has been loaded and
initialized.

Resolves: #91165
Releases: master
Change-Id: Ic4073faa5bd97f9b50bb8c3ada6864539c0ae63f
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/64307


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: Chris Müller <typo3@krue.ml>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Chris Müller <typo3@krue.ml>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>