`SimulationController::postWorldInitializationEventHandler(...)` shouldn't attempt to load a new map if `SPEAR.LAUNCH_MODE == "running_executable"` and we're running in the editor

[mikeroberts3000]

trafficstars

The correct behavior in this case is arguably to do nothing. Alternatively, if we do want to load a map in this case, we need to handle it more carefully because world->GetPathName() will return an unexpected value, and we will trigger ASSERT(!has_open_level_executed_).