Adjust plot bounds for DataLoader plot grid showing all built-in datasets

[stefmolin]

Fixes #223

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.53%. Comparing base (e440ee7) to head (8d06cb4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #243   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files          58       58           
  Lines        1907     1911    +4     
  Branches      114      114           
=======================================
+ Hits         1879     1883    +4     
  Misses         25       25           
  Partials        3        3           

Files with missing lines	Coverage Δ
src/data_morph/data/loader.py	100.00% <100.00%> (ø)

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