Revert "Migrate buildings and TGOs to unit map."

Not registering kills correctly. It was in my limited testing, so need
to dig deeper.

https://github.com/Khopa/dcs_liberation/issues/494

This reverts commit 90697194a1.

game/operation/operation.py

@@ -265,8 +265,7 @@ class Operation:
             cls.current_mission,
             cls.game,
             cls.radio_registry,
-            cls.tacan_registry,
-            cls.unit_map
+            cls.tacan_registry
         )
         cls.groundobjectgen.generate()