Update T1485.yaml (#1395)

Let the file which will be deleted be more dynamic to allow users to define thier own using an input argument

Co-authored-by: Carrie Roberts <clr2of8@gmail.com>

atomics/T1485/T1485.yaml

@@ -29,7 +29,7 @@ atomic_tests:
       Remove-Item $env:TEMP\SDelete.zip -Force
   executor:
     command: |
-      if (-not (Test-Path $env:TEMP\T1485.txt)) { New-Item $env:TEMP\T1485.txt -Force }
+      if (-not (Test-Path #{file_to_delete})) { New-Item #{file_to_delete} -Force }
       Invoke-Expression -Command "#{sdelete_exe} -accepteula #{file_to_delete}"
     name: powershell
 - name: macOS/Linux - Overwrite file with DD