Use the feature reference bug in the aconfig file as required for the flag rollout process.

The aconfig is currently referring to the bug for the flag itself, but the rollout process requires the feature bug to check for approvals.

Test: n/a
Flag: android.permission.flags.health_connect_backup_restore_permission_enabled
Bug: 328188870

Change-Id: I22b9db2d0c3aa5252a18708021a6745eea31a5a6