Hide storage footer on app permission group screen

allowed_denied.xml preferences used for multiple fragments, but only
managed (hidden) on one of the usages. Hide on fragments that don't use
it explicitly

Relnote: Fix double line in app permission groups screen
Bug: 297843472
Test: manual
Change-Id: Ibc8b69fb3e42a4400ae8f7c67439cbad10d4fc39