API: Set backwards-compatibility boolean metadata
This extension was not following API conventions for returning of
boolean values, and so broke with the recent ApiResult changes in core.
Bug: T97636
Change-Id: I485b98fab5e4df87674f805440b16ab3adb7fa1f
(cherry picked from commit c08c506a683417d78c64f139f77934144cf0e8d9)