Made buildings unable to overlap

Assets/Scenes/SampleScene.unity

@@ -1304,9 +1304,9 @@ RectTransform:
   - {fileID: 2112507919}
   - {fileID: 2026916298}
   - {fileID: 96288173}
+  - {fileID: 2005593404}
   - {fileID: 1330313875}
   - {fileID: 1194686691}
-  - {fileID: 2005593404}
   m_Father: {fileID: 0}
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
   m_AnchorMin: {x: 0, y: 0}
@@ -1641,7 +1641,7 @@ MonoBehaviour:
   RectTransform: {fileID: 1330313875}
   BuildingPreview: {fileID: 1194686692}
   CursorImage: {fileID: 1330313876}
-  BuildingManager: {fileID: 0}
+  BuildingManager: {fileID: 2005593405}
   BuildingPrefab: {fileID: 8624048914473773482, guid: 1b5c88b3f8d08674a9b15155d6ba9a36,
     type: 3}
   CurrentMouseClickStrength: 0