[Catalyst] Partially revert ag/30664694

The preference is not yet migrated, we should not update fragment based
on current flag rollout plan.

Bug: 368355361
Bug: 368359963
Flag: com.android.settings.flags.catalyst_tether_settings
Test: manual
Change-Id: I89a5d2ee29e1c3428d40428b3d3d4ba3afcd4ece