Fix regression: Showing teles in customloadquick

This fixes a regression where main game teleporter icons (which would be
target icons if flag 12 was on) would be rendered on the minimap after
loading from a custom quicksave.

This is because this was always enabled when loading from a custom
quicksave, but the game didn't start rendering them until PR #898, which
de-duplicated the minimap rendering code.

The best fix here is to just not enable the teleporters when loading
from custom quicksaves.

desktop_version/src/Game.cpp

@@ -5574,10 +5574,6 @@ void Game::customloadquick(const std::string& savfile)
             map.roomname_special = true;
         }
     }
-
-    map.showteleporters = true;
-    if(obj.flags[12]) map.showtargets = true;
-
 }
 
 struct Summary