gui: avoid clean simulation after simulation

app/gui/simulation-editor.cpp

@@ -193,8 +193,6 @@ run_synchronized_simulation(window_logger& log_w,
               std::chrono::duration<double>(duration));
     } while (current < end && !stop);
 
-    sim.clean();
-
     st = editor_status::running_thread_need_join;
 }
 
@@ -228,8 +226,6 @@ run_simulation(window_logger& log_w,
         }
     } while (current < end && !stop);
 
-    sim.clean();
-
     st = editor_status::running_thread_need_join;
 }