- Corrected autohotkey/choco install script, added setup for powershell

windows/autohotkey.ps1

@@ -1,10 +1,9 @@
-$testchoco = powershell choco -v
-if(-not($testchoco)){
+if(-not(Get-Command "choco" -errorAction SilentlyContinue)){
     Write-Output "Seems Chocolatey is not installed, installing now"
     Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
 }
 else{
-    Write-Output "Chocolatey Version $testchoco is already installed"
+    Write-Output "Chocolatey is already installed"
 }
 
 if(-not(test-path "C:\Program Files\AutoHotkey\AutoHotkey.exe")){