Update focus/hover style for link-button

[mdvorscak]

To match the default browser style

[coveralls]

Coverage remained the same at 99.484% when pulling ffcfc61 on mdvorscak:patch-1 into 46369c3 on evcohen:master.

[jessebeach]

To match the default browser style

@mdvorscak thank you for the PR. Could you link me to the default stylesheet for Chrome with this value?

[jessebeach]

I found the reference: https://source.chromium.org/chromium/chromium/src/+/master:third_party/blink/renderer/core/html/resources/controls_refresh.css;l=25

[codecov]

Codecov Report

Merging #662 (2501a7f) into master (9eea790) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #662   +/-   ##
=======================================
  Coverage   99.24%   99.24%           
=======================================
  Files          98       98           
  Lines        1453     1453           
  Branches      477      477           
=======================================
  Hits         1442     1442           
  Misses         11       11           

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[jessebeach]

lgtm