[37262] changed a check in `redirect_canonical()` so that it checked
categories in the object cache rather than querying the database. However,
the check was based on the identity of `WP_Term` objects, which in
certain cases can be augmented by the main WP query routine, causing
failures of the `in_array()` check. This caused unnecessary redirects
for URLs where `is_single()` is true, but the URL is different from the
post permalink, such as the `embed` endpoint.
`has_term()` also checks the cache, but does not sufer from this bug.
Props cmillerdev.
Fixes#36602.
git-svn-id: https://develop.svn.wordpress.org/trunk@38216 602fd350-edb4-49c9-b593-d223f7449a82
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