fix: Fixed cropping mode in predictor

[fg-mindee]

This PR fixes the cropping mode when both frameworks are available. #458 introduced an issue occurring for users with both frameworks installed. SInce the priority (default framework mode) is TensorFlow, this PR switches the condition to ensure proper cropping.

Any feedback is welcome!

[codecov]

Codecov Report

Merging #461 (0180be4) into main (acb510d) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #461      +/-   ##
==========================================
+ Coverage   95.79%   95.82%   +0.02%     
==========================================
  Files          96       96              
  Lines        4023     4023              
==========================================
+ Hits         3854     3855       +1     
+ Misses        169      168       -1     

Flag	Coverage Δ
unittests	95.82% <100.00%> (+0.02%)	⬆️

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Impacted Files	Coverage Δ
doctr/models/core.py	93.84% <100.00%> (ø)
...dels/detection/differentiable_binarization/base.py	91.97% <0.00%> (+0.61%)	⬆️

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[charlesmindee]

Thanks for the fix!