Fix error Invaild password mpsk

[agmes4]

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Please make sure though you did the following (tick off everything you
already did):

• Run the tests and see them pass
• Rebase your branch on top of develop
• Include tests for features you introduced / bugs you fixed

This issue fixes #

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 29.63%. Comparing base (54d3e0e) to head (eacb01e).
⚠️ Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
sipa/model/pycroft/user.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #533      +/-   ##
===========================================
+ Coverage    29.59%   29.63%   +0.04%     
===========================================
  Files           71       71              
  Lines         8610     8615       +5     
===========================================
+ Hits          2548     2553       +5     
  Misses        6062     6062              

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[FelixFelix0815]

lgtm