Fix flat hand mean

[pangyyyyy]

flat_hand_mean flag is not working in SMPLXlayer and MANOlayer

[codecov]

Codecov Report

Base: 84.91% // Head: 84.93% // Increases project coverage by +0.02% 🎉

Coverage data is based on head (db3507b) compared to base (32fb6c7).
Patch coverage: 26.66% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #301      +/-   ##
==========================================
+ Coverage   84.91%   84.93%   +0.02%     
==========================================
  Files         200      200              
  Lines       17570    17618      +48     
==========================================
+ Hits        14919    14964      +45     
- Misses       2651     2654       +3     

Flag	Coverage Δ
unittests	84.93% <26.66%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
mmhuman3d/models/body_models/mano.py	26.96% <16.66%> (-0.75%)	⬇️
mmhuman3d/models/body_models/smplx.py	83.33% <33.33%> (-3.39%)	⬇️
mmhuman3d/models/body_models/star.py	100.00% <0.00%> (ø)
mmhuman3d/core/renderer/matplotlib3d_renderer.py	100.00% <0.00%> (ø)
...uman3d/data/data_converters/mpi_inf_3dhp_hybrik.py	99.09% <0.00%> (+<0.01%)	⬆️
mmhuman3d/data/data_structures/human_data.py	98.74% <0.00%> (+0.03%)	⬆️
mmhuman3d/data/data_converters/penn_action.py	98.11% <0.00%> (+0.03%)	⬆️
mmhuman3d/data/data_converters/eft.py	97.05% <0.00%> (+0.04%)	⬆️
.../models/architectures/expressive_mesh_estimator.py	78.06% <0.00%> (+0.04%)	⬆️
mmhuman3d/data/datasets/human_image_dataset.py	76.05% <0.00%> (+0.06%)	⬆️
... and 8 more

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