fix(mfdataplist): accept DataFrame with tuple cellid

[wpbonelli]

Fix an inconsistency mentioned in #2758. pd.DataFrame with a tuple cellid column was rejected by .set_data() while the equivalent recarray form was accepted. Accept tuple cellid for DataFrame too.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.5%. Comparing base (556c088) to head (511cebf).
⚠️ Report is 169 commits behind head on develop.

Files with missing lines	Patch %	Lines
flopy/mf6/data/mfdataplist.py	85.7%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2767      +/-   ##
===========================================
+ Coverage     55.5%    72.5%   +17.0%     
===========================================
  Files          644      677      +33     
  Lines       124135   132696    +8561     
===========================================
+ Hits         68947    96277   +27330     
+ Misses       55188    36419   -18769     

Files with missing lines	Coverage Δ
flopy/mf6/data/mfdataplist.py	72.0% <85.7%> (-6.9%)	⬇️

... and 579 files with indirect coverage changes

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