Miguel Fonseca 81e0366e57 Update sidebars_widgets to match Twenty Nineteen's single widget area
* Also update the customizer tests to match it.

Props SergeyBiryukov, pento.



git-svn-id: https://develop.svn.wordpress.org/branches/5.0@43954 602fd350-edb4-49c9-b593-d223f7449a82
2018-11-30 20:24:42 +00:00
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