PowerShellHistory Exception

[leechristensen]

Describe the bug
PowerShellHistory was failing with the following error:

ERROR:   [!] Terminating exception running command 'PowerShellHistory': System.ArgumentOutOfRangeException: StartIndex cannot be less than zero.
Parameter name: startIndex
   at System.String.Substring(Int32 startIndex, Int32 length)
   at Windows.PowerShellHistoryCommand.<Execute>d__10.MoveNext()
   at Runtime.ExecuteCommand(CommandBase command, String[] commandArgs)

Not sure what was causing it and don't have the ConsoleHost_history.txt to troubleshoot

To Reproduce
Run Seatbelt.exe -q PowerShellHistory

Expected behavior
For the command to run and no errors be thrown

Observed behavior
An exception was thrown due to string parsing bugs