[TASK] Unify modal button style

Creating new content is usually confirmed with a blue button.
This is inconsistent with the dashboard, which uses an orange button.
This patch changes the orange button to a blue one to be consistent.

Resolves: #95098
Releases: main
Change-Id: Icd7de182403722af9b0866b69949c457e94ce192
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/74064


Tested-by: core-ci <typo3@b13.com>
Tested-by: Georg Ringer <georg.ringer@gmail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Georg Ringer <georg.ringer@gmail.com>
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>