Avoid unnecessary redrawing of vehicle list windows

Redraw info section every tick if values have changed

src/tbtr_template_gui_create.cpp

@@ -169,8 +169,6 @@ public:
 			virtual_train = nullptr;
 		}
 
-		SetWindowClassesDirty(WC_TRAINS_LIST);
-
 		/* more cleanup */
 		*create_window_open = false;
 		DeleteWindowById(WC_BUILD_VIRTUAL_TRAIN, this->window_number);