Fix f6dd505: Remove unneeded error when switching between depot actions

src/lang/english.txt

@@ -5112,7 +5112,6 @@ STR_ERROR_UNBUNCHING_NO_FULL_LOAD                               :{WHITE}... cann
 STR_ERROR_UNBUNCHING_NO_UNBUNCHING_FULL_LOAD                    :{WHITE}... cannot unbunch a vehicle with a full load order
 STR_ERROR_UNBUNCHING_NO_CONDITIONAL                             :{WHITE}... cannot use conditional orders when vehicle has an unbunching order
 STR_ERROR_UNBUNCHING_NO_UNBUNCHING_CONDITIONAL                  :{WHITE}... cannot unbunch a vehicle with a conditional order
-STR_ERROR_UNBUNCHING_NO_SERVICE_IF_NEEDED                       :{WHITE}... vehicle must always visit the depot to unbunch there
 
 # Autoreplace related errors
 STR_ERROR_TRAIN_TOO_LONG_AFTER_REPLACEMENT                      :{WHITE}{VEHICLE} is too long after replacement

src/order_cmd.cpp

@@ -1300,9 +1300,6 @@ CommandCost CmdModifyOrder(DoCommandFlag flags, VehicleID veh, VehicleOrderID se
 
 		case MOF_DEPOT_ACTION:
 			if (data >= DA_END) return CMD_ERROR;
-			/* The vehicle must always go to the depot (not just if it needs servicing) in order to unbunch there. */
-			if ((data == DA_SERVICE) && (order->GetDepotActionType() & ODATFB_UNBUNCH)) return_cmd_error(STR_ERROR_UNBUNCHING_NO_SERVICE_IF_NEEDED);
-
 			/* Check if we are allowed to add unbunching. We are always allowed to remove it. */
 			if (data == DA_UNBUNCH) {
 				/* Only one unbunching order is allowed in a vehicle's orders. If this order already has an unbunching action, no error is needed. */
@@ -1312,8 +1309,6 @@ CommandCost CmdModifyOrder(DoCommandFlag flags, VehicleID veh, VehicleOrderID se
 					if (o->IsType(OT_CONDITIONAL)) return_cmd_error(STR_ERROR_UNBUNCHING_NO_UNBUNCHING_CONDITIONAL);
 					/* We don't allow unbunching if the vehicle has a full load order. */
 					if (o->IsType(OT_GOTO_STATION) && o->GetLoadType() & (OLFB_FULL_LOAD | OLF_FULL_LOAD_ANY)) return_cmd_error(STR_ERROR_UNBUNCHING_NO_UNBUNCHING_FULL_LOAD);
-					/* The vehicle must always go to the depot (not just if it needs servicing) in order to unbunch there. */
-					if (o->IsType(OT_GOTO_DEPOT) && o->GetDepotOrderType() & ODTFB_SERVICE) return_cmd_error(STR_ERROR_UNBUNCHING_NO_SERVICE_IF_NEEDED);
 				}
 			}
 			break;