tastudio: fix crash when comparing branches with identical input and different length.

it was setting loop count basing on a longer branch (if it's current), the shorter one going OOB.

BizHawk.Client.Common/movie/tasproj/TasMovie.cs

@@ -477,7 +477,7 @@ namespace BizHawk.Client.Common
 		private int? DivergantPoint(List<string> currentLog, List<string> newLog)
 		{
 			int max = newLog.Count;
-			if (currentLog.Count > newLog.Count)
+			if (currentLog.Count < newLog.Count)
 			{
 				max = currentLog.Count;
 			}