Revert "fix: keep v2 modal above header"

This reverts commit fff9fb258d.

Co-authored-by: ajnart <49837342+ajnart@users.noreply.github.com>

apps/nextjs/src/components/layout/v2-beta-announcement/v2-beta-announcement.tsx

@@ -8,7 +8,6 @@ import {
   Anchor,
   Box,
   Button,
-  getDefaultZIndex,
   Group,
   Paper,
   SimpleGrid,
@@ -290,7 +289,6 @@ const V2BetaAnnouncementModal = createModal<V2BetaAnnouncementModalProps>(({ inn
   defaultTitle: "Homarr v2 beta",
   size: 1000,
   centered: true,
-  zIndex: getDefaultZIndex("modal") + 2,
 });
 
 interface V2BetaInstallInstructionsProps {