Removed the file added for testing

Signed-off-by: Ashique P S <Ashique.saidalavi@progress.com>

omnibus/resources/chef-workstation/msi/assets/secrets.ps1

-$chefws_bin = (split-path $MyInvocation.MyCommand.Definition -Parent)
-$AccessKey = (-join ((33..126) | Get-Random -Count 16 | % {[char]$_}))
-
-# $test_path = Join-Path "C:\opscode\chef-workstation\" "testing.txt" -Resolve
-$test_path = "C:\opscode\chef-workstation\test.txt"
-$parent = split-path $test_path -Parent
-
-Set-Location -Path $parent
-
-Add-Content -Path "test.txt" -Value "This is a testing file"