PSAmsi cannot obfuscate Invoke-Mimikatz.ps1 (obfuscation fails)

The obfuscation functionality fails and this line is reached:

```ps
# If we've run through all the strings and the string is still flagged, obfuscation fails
If (($TokenIndex -ge ($MatchingTokens.Count-1))) { $DoneObfuscating = $True }
```
(https://github.com/cobbr/PSAmsi/blob/master/PSAmsiClient.ps1#L3177)

Reproduce the failure with Invoke-Mimikatz.ps1 and inspect PSAmsiClient.ps1 around line 3177, where obfuscation is reported as failed after the matching tokens are processed. Trace the token-processing path to determine why the input remains flagged, then verify that obfuscation completes successfully for this script.

Written by the indexing model from the issue text.