Fix pareto dominance definition

[hannah-jan]

This PR:

• Fixes the definition of Pareto dominance in pareto_front.py to account for solutions which have the same fitness values along one axis.

[hannah-jan]

Hello!!

@Lookatator thanks for the comment!!

Sorry I did it in a rush (classic me) so put it in the wrong definition.

Both Pareto Dominance definitions should be updated now ☺️

[codecov-commenter]

Codecov Report

Attention: 241 lines in your changes are missing coverage. Please review.

Comparison is base (f6a0b71) 92.31% compared to head (f1a2390) 90.96%. Report is 29 commits behind head on develop.

Files	Patch %	Lines
qdax/environments/humanoidtrap.py	18.30%	58 Missing :warning:
qdax/core/neuroevolution/losses/td3_loss.py	41.66%	28 Missing :warning:
qdax/core/neuroevolution/buffers/buffer.py	37.14%	22 Missing :warning:
qdax/environments/wrappers.py	45.94%	20 Missing :warning:
qdax/core/containers/unstructured_repertoire.py	83.47%	19 Missing :warning:
qdax/core/containers/mels_repertoire.py	76.47%	16 Missing :warning:
qdax/baselines/pbt.py	76.47%	12 Missing :warning:
qdax/tasks/brax_envs.py	76.92%	9 Missing :warning:
tests/core_test/aurora_test.py	90.32%	9 Missing :warning:
qdax/core/neuroevolution/networks/networks.py	82.22%	8 Missing :warning:
... and 13 more

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #174 +/- ## =========================================== - Coverage 92.31% 90.96% -1.36% =========================================== Files 103 125 +22 Lines 5816 7657 +1841 =========================================== + Hits 5369 6965 +1596 - Misses 447 692 +245 ```

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