Fix Invoke-Shellcode OS architecture detection
Fix Invoke-Shellcode OS architecture detection

Fixes issue #70

mattifestation/PowerSploit,api0cradle/PowerSploit,jakxx/PowerSploit,chouchouzzj/Powershell,secabstraction/PowerSploit,secabstraction/PowerSploit,api0cradle/PowerSploit,jakxx/PowerSploit,chouchouzzj/Powershell,mattifestation/PowerSploit