'read_private_pages' capability broken

[McShelby]

'read_private_pages' capability does not work as expected and causes the pages author data not to set up properly.

This is because of a copy/paste typo from the 'read_private_posts' functionality. A patch is attached to this report.

[McShelby]

Btw: Additionally my Tortoise did include some line break fix into the patch file.

[ryan]

(In [4825]) Fix typo in read_pages conditional. Props McShelby. fixes #3705