Remove leftover script from outdated installation method.

AutoTx/Resources/Create-ElevatedCmdShortcut.ps1

-$lnkfile = ".\elevated-cmd.lnk"
-
-$WshShell = New-Object -comObject WScript.Shell
-$Shortcut = $WshShell.CreateShortcut($lnkfile)
-$Shortcut.TargetPath = "%windir%\system32\cmd.exe"
-$Shortcut.Save()
-
-$bytes = [System.IO.File]::ReadAllBytes($lnkfile)
-$bytes[0x15] = $bytes[0x15] -bor 0x20     #set byte 21 (0x15) bit 6 (0x20) ON
-[System.IO.File]::WriteAllBytes($lnkfile, $bytes) 
\ No newline at end of file