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

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

src/newgrf_gui.cpp

@@ -1097,8 +1097,8 @@ struct NewGRFWindow : public Window, NewGRFScanCallback {
 				if (!this->editable) break;
 				if (this->execute) {
 					ShowQuery(
-						STR_NEWGRF_POPUP_CAUTION_CAPTION,
-						STR_NEWGRF_CONFIRMATION_TEXT,
+						GetEncodedString(STR_NEWGRF_POPUP_CAUTION_CAPTION),
+						GetEncodedString(STR_NEWGRF_CONFIRMATION_TEXT),
 						this,
 						NewGRFConfirmationCallback
 					);