Player.place_building places upgrading site for enhancable buildings

[Benedikt Straub]

If you place a "empire_sentry" or "empire_barrier" constructionsite using lua like this:
   player:place_building(building, field, true)
Then the constructionsite always looks as if you had enhanced an empire blockhouse/outpost. It should instead look like a normal constructionsite for buildings that can be built directly.

[GunChleoc (gunchleoc)]

Migrated to https://github.com/widelands/widelands/issues/3356