fix saml_forge.py script; fix typo

[thug-gamer]

The script had a mismatch between the saml-metadata and the saml-assertion (https://attacker-idp.invalid/idp vs. https://attacker-idp.attacker.invalid/idp)

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[carlospolop]

Hi @thug-gamer !
Unfortunately just fixing typos are not enough to reduce by 1 the flags needed.
Please, if you still want this PR merge, change the title of this PR

[thug-gamer]

Sure, I just stumbled over the issue in the script and I believe it will help others not run into the same issue.
I changed the title.