Update default-build.yml (#41466)

Co-authored-by: William Godbe <[email protected]>

Author: github-actions[bot]

.azure/pipelines/jobs/default-build.yml

@@ -120,12 +120,7 @@ jobs:
       ${{ if eq(parameters.agentOs, 'Windows') }}:
         ${{ if eq(variables['System.TeamProject'], 'public') }}:
           name: NetCore1ESPool-Public
-          ${{ if ne(parameters.isAzDOTestingJob, true) }}:
-            # Visual Studio Build Tools
-            demands: ImageOverride -equals Build.Server.Amd64.VS2019.BT.Open
-          ${{ if eq(parameters.isAzDOTestingJob, true) }}:
-            # Visual Studio Enterprise - contains some stuff, like SQL Server and IIS Express, that we use for testing
-            demands: ImageOverride -equals Build.Server.Amd64.VS2019.Open
+          demands: ImageOverride -equals 1es-windows-2019-open
         ${{ if eq(variables['System.TeamProject'], 'internal') }}:
           name: NetCore1ESPool-Internal
           # Visual Studio Enterprise - contains some stuff, like SQL Server and IIS Express, that we use for testing