[NTP] Fix hover on disabled menu item in dark mode

Do not show the hover style in dark mode when the option is disabled.

Bug: 939705
Change-Id: I5a60ca32803de8bfd334de5bb33e4c80ca476e47
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1512262
Commit-Queue: Kristi Park <kristipark@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Auto-Submit: Kristi Park <kristipark@chromium.org>
Reviewed-by: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#639146}
1 file changed