Codechange: Use EncodedString for Query window. (#13528)

This removes the need to separately capture and store global parameters.

src/depot_gui.cpp

@@ -822,11 +822,9 @@ struct DepotWindow : Window {
 			case WID_D_SELL_ALL:
 				/* Only open the confirmation window if there are anything to sell */
 				if (!this->vehicle_list.empty() || !this->wagon_list.empty()) {
-					SetDParam(0, this->type);
-					SetDParam(1, this->GetDestinationIndex());
 					ShowQuery(
-						STR_DEPOT_CAPTION,
-						STR_DEPOT_SELL_CONFIRMATION_TEXT,
+						GetEncodedString(STR_DEPOT_CAPTION, this->type, this->GetDestinationIndex()),
+						GetEncodedString(STR_DEPOT_SELL_CONFIRMATION_TEXT),
 						this,
 						DepotSellAllConfirmationCallback
 					);