Revert "Fixed: Incorrect SpawnPotentials structure when adjusting spawn positions during copy and import."

This reverts commit 66c934725f1daac641d82e452e1f6a1a2f432815.
Revert "Fixed: TileEntity.copyWithOffset adjusts mob position data for mob spawner blocks"

This reverts commit 6ed8c45e4b2db4b1482f875f815fc3d49c3f91e5.