danielbachhuber 6c9675bf37 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.
Merges [42965] to the 5.0 branch.
Fixes #42382.

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git-svn-id: http://core.svn.wordpress.org/branches/5.0@43600 1a063a9b-81f0-0310-95a4-ce76da25c4cd
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