fix editing annotation

Azaion.Annotator/DTO/FormState.cs

@@ -17,6 +17,7 @@ public class FormState
 
     public int CurrentVolume { get; set; } = 100;
     public ObservableCollection<AnnotationResult> AnnotationResults { get; set; } = [];
+    public WindowsEnum ActiveWindow { get; set; }
 
     public string GetTimeName(TimeSpan ts) => $"{VideoName}_{ts:hmmssf}";
 
@@ -38,4 +39,4 @@ public class FormState
         }
         catch (Exception e) {  return null;  }
     }
-}
+}