Codechange: Pass raw string to editable query window. (#13481)

This avoids separating string id and parameters. EncodedString is not needed as it is the raw text that is editable.

src/signs_gui.cpp

@@ -428,8 +428,7 @@ struct SignWindow : Window, SignList {
 	{
 		/* Display an empty string when the sign hasn't been edited yet */
 		if (!si->name.empty()) {
-			SetDParam(0, si->index);
-			this->name_editbox.text.Assign(STR_SIGN_NAME);
+			this->name_editbox.text.Assign(GetString(STR_SIGN_NAME, si->index));
 		} else {
 			this->name_editbox.text.DeleteAll();
 		}