61837: REST API: Password should only be considered by permissions check when in query params

[kadamwhite]

Trac ticket: https://core.trac.wordpress.org/ticket/61837

request[password] is checked when calculating item permissions, and this check does not restrict itself to looking at the password provided as a query parameter.

Adding unit tests for failing situation described in ticket, then will update with a merged patch.

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Props kadamwhite, timothyblynjacobs.

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[TimothyBJacobs]

I like it!

[kadamwhite]

Merged in 15b7d2a