[ox] Add optional typename to satisfy clangd

(synced from ade6af8698)

src/ox/std/stringview.hpp

@@ -109,7 +109,7 @@ struct MaybeSV<T, true> {
 	using type = ox::StringView;
 };
 template<typename T>
-using MaybeSV_t = MaybeSV<T>::type;
+using MaybeSV_t = typename MaybeSV<T>::type;
 
 
 }