[BUGFIX] Apply inline icon styles with nonce attribute

Since issue #100270 some icons are not rendered anymore in the
backend when having a strict `style-src` CSP directive enabled
(not allowing `'unsafe-inline'`, using a `'nonce-...'` instead).

Resolves: #100547
Related: #100270
Releases: main
Change-Id: Ida6b51641536dc89c022dbf155ad4c2e44e56632
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/78555


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