Codechange: use Date/Year constructor explicitly

src/script/api/script_subsidy.cpp

@@ -58,7 +58,7 @@
 	ymd.day = 1;
 	auto m = ymd.month + ::Subsidy::Get(subsidy_id)->remaining;
 	ymd.month = (m - 1) % 12 + 1;
-	ymd.year += (m - 1) / 12;
+	ymd.year += TimerGameEconomy::Year{(m - 1) / 12};
 
 	return (ScriptDate::Date)TimerGameEconomy::ConvertYMDToDate(ymd.year, ymd.month, ymd.day).base();
 }