[Permissions Hub Refactor] Fix flicker seen when Permissions Hub pages load

This is because we are loading twice, once with stale data and then again
with fresh data. It seems to update pretty quickly on my device, so it
might be okay to load once only, which will remove flicker.

Bug: 277124383
Test: manual
Change-Id: Id8a7459ecc84edf4511ba66ffe001656d767606e