Fix Bkm to Bk2 conversion

BizHawk.Client.Common/movie/MovieService.cs

@@ -18,7 +18,9 @@ namespace BizHawk.Client.Common
 
 			if (Path.GetExtension(path).EndsWith("bkm"))
 			{
-				return new BkmMovie(path).ToBk2();
+				var bkm = new BkmMovie(path);
+				bkm.Load();
+				return bkm.ToBk2();
 			}
 
 			// Default to bk2

BizHawk.Client.Common/movie/conversions/MovieConversionExtensions.cs

@@ -75,6 +75,7 @@ namespace BizHawk.Client.Common.MovieConversionExtensions
 				bk2.AppendFrame(input);
 			}
 
+			bk2.Save();
 			return bk2;
 		}