fix clearing cell fields before comparing

[murilo-cunha]

needed to remove metadata such as id that would make every cell be different

[codecov]

Codecov Report

Merging #24 (080c7ab) into main (c36dbbd) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #24      +/-   ##
==========================================
+ Coverage   95.67%   95.70%   +0.03%     
==========================================
  Files          18       18              
  Lines         763      769       +6     
==========================================
+ Hits          730      736       +6     
  Misses         33       33              

Impacted Files	Coverage Δ
databooks/conflicts.py	90.00% <100.00%> (+1.11%)	⬆️
tests/test_cli.py	100.00% <100.00%> (ø)

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