[audio] Fix incorrect isolated owner for multiuser

The owning uid was used directly, rather than its app-id when querying
into the package map. This led to early return and a failure to sync the
isolated proc on devices where the HDS is not running in user 0.

Test: atest AlwaysOnHotwordDetectorTest on multi-user
Bug: 396040470
Flag: EXEMPT bugfix
Change-Id: I10eff5e10e92570d2546c0435acbe4826363289a