avoid duplicated keys in kwargs and pf_options in run_contingency()

[SteffenMeinecke]

This PR avoids duplicated keys in kwargs and pf_options in run_contingency().

[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 75.61%. Comparing base (b323ab5) to head (cd8e32f).
Report is 5 commits behind head on develop.

Files with missing lines	Patch %	Lines
pandapower/contingency/contingency.py	80.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2478   +/-   ##
========================================
  Coverage    75.60%   75.61%           
========================================
  Files          284      284           
  Lines        33796    33802    +6     
========================================
+ Hits         25553    25558    +5     
- Misses        8243     8244    +1     

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