[clang-tidy] replace std::bind with lambdas

Found with modernize-avoid-bind

Signed-off-by: Rosen Penev <rosenp@gmail.com>

src/db/DatabasePlaylist.cxx

@@ -39,7 +39,6 @@ search_add_to_playlist(const Database &db, const Storage *storage,
 		       const DatabaseSelection &selection)
 {
 	using namespace std::placeholders;
-	const auto f = std::bind(AddSong, storage,
-				 playlist_path_utf8, _1);
+	const auto f = [=](auto && arg1) { return AddSong(storage, playlist_path_utf8, arg1); };
 	db.Visit(selection, f);
 }