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The page switcher buttons on the folder view didn't show the ripple
effect when hovered, as opposed to the page switcher on the app list.
This change adds the effect to be consistent

Bug: 998388
Change-Id: I49e48680a9bb4106e069c0e031b1e43c7c120794
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1816982
Commit-Queue: Ana Salazar <anasalazar@chromium.org>
Reviewed-by: Alex Newcomer <newcomer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698661}