Change PyMAF-X path coding

[Wei-Chen-hub]

Removes the hard-coding of path, and allows for different working directory.

other than 'some_path/mmhuman3d'

Just modify the variable in config file:

mmhuman3d_data_path = 'data'
mmhuman3d_config_path = 'configs'
_base_ = [f'../../{mmhuman3d_config_path}/_base_/default_runtime.py']

For demo purpose, the original command works as well

[codecov]

Codecov Report

Attention: Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.

Project coverage is 85.48%. Comparing base (0e0c2ce) to head (99ab70d).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
mmhuman3d/models/body_models/smplx.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #328   +/-   ##
=======================================
  Coverage   85.48%   85.48%           
=======================================
  Files         208      208           
  Lines       19642    19645    +3     
=======================================
+ Hits        16791    16794    +3     
  Misses       2851     2851           

Flag	Coverage Δ
unittests	85.48% <87.50%> (+<0.01%)	⬆️

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