minor fixes for mf6 model setup

[apryet]

Missing **kwargs argument in setup_tdis() caused crash when called from package_setup.

Boolean var from_model not initialized when data taken from a file.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.31%. Comparing base (4bfd847) to head (45bcf02).

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop      #80   +/-   ##
========================================
  Coverage    89.31%   89.31%           
========================================
  Files           64       64           
  Lines        12545    12546    +1     
========================================
+ Hits         11205    11206    +1     
  Misses        1340     1340           

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[aleaf]

Thanks @apryet !