Only lock context when editing, not creating

Elwig/Windows/AdministrationWindow.cs

@@ -20,14 +20,14 @@ namespace Elwig.Windows {
             get { return _IsEditing; }
             set {
                 _IsEditing = value;
-                LockContext = IsEditing || IsCreating;
+                LockContext = IsEditing;
             }
         }
         protected bool IsCreating {
             get { return _IsCreating; }
             set {
                 _IsCreating = value;
-                LockContext = IsEditing || IsCreating;
+                LockContext = IsEditing;
             }
         }