Adam Silverstein b76da1fdf3 REST API: Handle api-request query parameters with plain permalinks.
When constructing the request URL, ensure that  `?` is replaced with `&` when the API root  already contains a `?`. Fixes an issue where requests were broken when sites had permalinks set to plain.

Props aduth.
Fixes #42382.


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git-svn-id: http://core.svn.wordpress.org/trunk@42794 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2018-04-09 13:10:31 +00:00
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