Fix issue 11848 - Accordion Panel within an Accordion Panel is broken #12145
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Issue #11848 was fixed in 4.1.0 but was reintroduced in 4.1.1+ after PR #11935 (see https://stackblitz.com/edit/angular-ivy-q8x2la?file=package.json). This PR should now fix #11848 again while also making sure #11924 (which PR #11935 aimed to fix) is not reintroduced.
The active accordion tab should only affect the styling of the .p-toggleable-content for the direct children and not of any sub-accordions, which is what this css change fixes.