Forward save_config! keyword arguments to set_preferences!

[serenity4]

Fixes #679 by forwarding all provided keyword arguments to Preferences.set_preferences!. In particular, this allows the use of force = true to overwrite any existing preferences.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (2c33b9a) to head (29c414c).
⚠️ Report is 88 commits behind head on master.

Files with missing lines	Patch %	Lines
src/preferences.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #680    +/-   ##
=======================================
  Coverage    0.00%   0.00%            
=======================================
  Files           9      22    +13     
  Lines        1556    1807   +251     
=======================================
- Misses       1556    1807   +251     

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[aviatesk]

Thanks!