kadamwhite REST API: Pass correct ID to `meta->update_value` to permit setting t…
…erm meta during term creation.

Props joehoyle.
Fixes #44834.



git-svn-id: https://develop.svn.wordpress.org/trunk@43636 602fd350-edb4-49c9-b593-d223f7449a82
Latest commit e29d895 Sep 12, 2018