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[iOS] Cleanup overscroll actions code after dark mode

With the new dark mode design, the icons no longer change color when
they are highlighted. This means that the extra masking is all no
longer needed and can be cleaned up.

Fixed: 986804
Change-Id: I796a6fa6d4db5f478361823c5e216527bd875f77
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2023658Reviewed-by: Kurt Horimoto <kkhorimoto@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#736805}