BOONE, N.C. Louisiana scratched across the go-ahead run in the 10th inning and held off Appalachian State for a 5-4 Sun Belt Conference victory Friday night at Smith Stadium.The Ragin Cajuns improved to 31-19 overall and 13-12 in conference play, while App State fell to 28-19 and 15-10 in the league.Louisiana jumped ahead early, scoring once in the second inning and adding another run in the third for a 2-0 lead. The Cajuns extended the advantag…