Update T1021.003.yaml

Removed auto_generated_guid

atomics/T1021.003/T1021.003.yaml

@@ -23,7 +23,6 @@ atomic_tests:
       [activator]::CreateInstance([type]::GetTypeFromProgID("MMC20.application","#{computer_name}")).Document.ActiveView.ExecuteShellCommand("c:\windows\system32\calc.exe", $null, $null, "7")
     name: powershell
 - name: PowerShell Lateral Movement Using Excel Application Object
-  auto_generated_guid: b46d327c-c336-43d9-906e-d53be5358535
   description: |
     Powershell lateral movement using the Excel COM objects.