Update test/CNA templates React version to 19.2.0 (#84736)
The peerDeps are already bumped to 19.2.0 at
https://github.com/vercel/next.js/pull/84463, but the test/CNA templates
weren't updated as the `syncPagesRouterReact` value is always false at
the moment, which blocked the update.
Therefore, remove the `syncPagesRouterReact` condition to match the
actual peerDeps bump.
---------
Co-authored-by: vercel[bot] <35613825+vercel[bot]@users.noreply.github.com>
Co-authored-by: Sebastian Sebbie Silbermann <sebastian.silbermann@vercel.com>
