Update the AcceptDonation flag correctly when adding or removing the stripe account

backend/src/Web/Features/Contents/EventHandlers/StripeAccountConfiguredHandler.cs

@@ -28,7 +28,7 @@ public class StripeAccountConfiguredHandler(
             return;
         }
 
-        creator.AcceptDonation = true;
+        creator.AcceptDonation = !string.IsNullOrWhiteSpace(eventModel.StripeAccountId);
 
         var rows = await dbContext.SaveChangesAsync(ct);