Fix batch URL paths when using local sites.
Review Request #13445 — Created Dec. 1, 2023 and submitted
The fix for including the SITE_ROOT for the batch URL didn't properly
include the local site (since
RB.apiCallonly uses the
urlis undefined, in which case it assembles a URL
relative to the API root). This change fixes that up to properly include
it in the URL.
Was able to publish and use the batch operations on the dashboard from
within a local site.