Reverts "Marks Windows module_custom_host_app_name_test to be unflaky" (#135692)

Reverts flutter/flutter#135567
Initiated by: ricardoamador
This change reverts the following previous change:
Original Description:
<!-- meta-tags: To be used by the automation script only, DO NOT MODIFY.
{
  "name": "Windows module_custom_host_app_name_test"
}
-->
The issue https://github.com/flutter/flutter/issues/134644 has been closed, and the test has been passing for [50 consecutive runs](https://data.corp.google.com/sites/flutter_infra_metrics_datasite/flutter_check_test_flakiness_status_dashboard/?p=BUILDER_NAME:%22Windows%20module_custom_host_app_name_test%22).
This test can be marked as unflaky.

.ci.yaml

@@ -4673,6 +4673,7 @@ targets:
       task_name: hot_mode_dev_cycle_win_target__benchmark
 
   - name: Windows module_custom_host_app_name_test
+    bringup: true # Flaky https://github.com/flutter/flutter/issues/134644
     recipe: devicelab/devicelab_drone
     timeout: 60
     properties: