Nav Modifier Volumes continue to affect navigation when the sublevel is removed

Nav mesh is still affected by a nav modifier volume when added to a sublevel and then the sub level is removed.

Topdown character will not move into the space affected by Nav Modifier volume so not a rendering issue

1. Open Topdown project and hit P to see nav mesh
2. Create a new sub-level and add a Nav Modifier Volume to the sublevel so that it affects the navigation
3. Remove the sublevel
4. Build Navigation

Result: Nav mesh is still affected by the Nav Modifier Volume

Expected: Nav mesh reverts to its original state

Fix UE-51650

Request a info about UE-127172 bug tracker

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