Sergey Biryukov 1574b76f41 Twenty Nineteen: Fix hover appearance for outlined button block style.
The outlined button block style was displaying white text on a white background on hover. This update makes sure the text remains legible on hover when this button style is applied. 

Props rickalee, kjellr.
Merges [44370] to the 5.0 branch.
Fixes #45726.

git-svn-id: https://develop.svn.wordpress.org/branches/5.0@44424 602fd350-edb4-49c9-b593-d223f7449a82
2019-01-07 15:50:24 +00:00
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