Dark Mode: update paper-icon-button-light's ripple opacity

The only real change here is +25% effective opacity by raising both the
opacity of the <paper-ripple> (60% -> 100%) and the <div class="ripple">
inside of it (25% -> 40%) as the spec calls for 40% of the text color.

Screenshot: https://imgur.com/a/gxC4zy4
Spec: https://docs.google.com/presentation/d/1kJoBzf_HGYK-_FAJPAjD67TW8224dCPLA6dAhlDmysk/edit?ts=5c363f50#slide=id.g364d7f9db1_0_0

R=dpapad@chromium.org
BUG=883049

Change-Id: Ib8f2921ce1ac3317cdaebcc8ce0e482c70159931
Reviewed-on: https://chromium-review.googlesource.com/c/1420118
Commit-Queue: Dan Beam <dbeam@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624250}
1 file changed