[Android] Fix divider preference removed by upstream in SiteSettings Resolves https://github.com/brave/brave-browser/issues/54486 This commit adapts the Site settings for both cases - when Android Settings Containment flag is turned off or on. Upstream removed the `divider` preference from the screen when `isSettingsContainmentEnabled()` is true. Our order-adjustment code in `configureBravePreferences` relied on it being present, causing a null assert failure. Chromium change: https://source.chromium.org/chromium/chromium/src/+/3e7c1090fe6836b828c58f6ce31ef786aebce69a commit 3e7c1090fe6836b828c58f6ce31ef786aebce69a Author: Gazal <agazal@google.com> Date: Tue Sep 30 14:10:19 2025 -0700 [Settings containment] Remove unwanted dividers in Site Settings and All Sites pages Before: https://screenshot.googleplex.com/9nQ28EheaL6E5yR.png After: https://screenshot.googleplex.com/87LzVJaFcqxX2DU.png Bug: 433576895, 439725777 Change-Id: I55cf2f6a88d108d19c9fcc0be199194ee08bbe91 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6998571 Commit-Queue: Wenyu Fu <wenyufu@chromium.org> Reviewed-by: Wenyu Fu <wenyufu@chromium.org> Auto-Submit: Gazal Agarwal <agazal@google.com> Cr-Commit-Position: refs/heads/main@{#1523141}